對于準備考托福的同學(xué)來說，不知道準備得怎么樣呢？今天就和出國留學(xué)網(wǎng)的小編一起來看看TPO閱讀中有哪些托福寫作可以借鑒的表原因的表達？
說理在寫作中必不可少，而因果邏輯關(guān)系又是說理中不可或缺的。我們一直強調(diào)托福各單項的備考不是孤立的，托福閱讀中的很多內(nèi)容可以有效幫助我們提升托福寫作，下面小站君匯總了 TPO 中常用的表示原因的一些表達，防止大家一個 because 一用到底。大家有幾個替換就行，不用搞的太多，多了也記不住。記得時候最好以句子為單位來記，效率高一些。另外托福寫作水平的提升重在練習(xí)，因此除了識記大家還需要注意合理仿寫應(yīng)用。
result from
In general， it is believed that these two extinctions resulted from drastic environmental changes that followed meteorite impacts or massive volcanic eruptions. [TPO 15-2-1]
總體來說，這兩次滅絕被認為是隕石撞擊或者大規(guī)模的火山爆發(fā)導(dǎo)致的劇烈的環(huán)境變化造成的。
In general， it is believed that X results from A.
result primarily or mainly or largely from
The growth of independent guilds was furthered by the fact that surplus was not a result of domestic craft production but resulted primarily from international trading；
獨立行會不斷增加，是因為剩余價值的產(chǎn)生并非由于國內(nèi)生產(chǎn)，而是主要來自于國際間的貿(mào)易活動。
X is not a result of A but results primarily from B.
one of the most likely causes for
Evidence points to hunting by humans and habitat destruction as the likely causes for the current mass extinction. [TPO 15-2-3]
但有證據(jù)指出，人類狩獵以及破壞棲息地很可能是當(dāng)前大規(guī)模物種滅絕的原因。
Sb. points to A and B as the likely causes of X.
the explanation may be that
The explanation may be that the terrestrial planets were once much larger and richer in these materials but eventually lost them because of these bodies’ relative closeness to the Sun， which meant that their temperatures were relatively high. [TPO 16-3-6]
有一種解釋認為，類地行星曾經(jīng)體積更大并且物質(zhì)構(gòu)成上更為豐富多樣，但因為它們距太陽較近致使溫度相對較高而最終失去這些物質(zhì)。
the most obvious reason for sb to do sth is that
Few have directly questioned what might lead a teacher to want to become reflective. Apparently， the most obvious reason for teachers to work toward reflective practice is that teacher educators think it is a good thing. [TPO 9-2-6]
很少人直接質(zhì)疑什么可能讓一個教師想變成反思型教師。顯然，使教師朝著反思行為努力的最直接的原因是師資培訓(xùn)者認為這是一件很好的事情。
Few have directly questioned what might lead sb. to do X. Apparently， the most obvious reason for sb. to do X is that A.
partly due to
This has been so since ancient times， partly due to the geology of the area， which is mostly limestone and sandstone， with few deposits of metallic ore and other useful materials. Ancient demands for obsidian （a black volcanic rock useful for making mirrors and tools） led to trade with Armenia to the north， while jade for cutting tools was brought from Turkistan， and the precious stone lapis lazuli was imported from Afghanistan. [TPO 16-1-1]
這種情況（貿(mào)易是主要支柱）從古至今都是如此，一部分原因是中東地區(qū)的地質(zhì)環(huán)境——多為沙石和石灰?guī)r，金屬礦藏和其它有用材料很少。古代對黑曜石（一種火山巖，可以用來制作鏡子和工具）的需求引發(fā)了（中東地區(qū)）與北方的亞美尼亞之間的貿(mào)易；用作切削工具的玉石從土耳其斯坦購買；而貴重的琉璃青金石是從阿富汗地區(qū)進口。
Such anomalies are due to the relative abundance of the “isotopes” or varieties of each element.
出現(xiàn)這種反常現(xiàn)象，主要是因為相對豐富的“同位素”或者各種元素的多樣性。
because
Because there is no space in the periodic table between these two elements， Mendeleyev suggested that the atomic mass of indium be changed to a completely different value， where it would fill an empty space between cadmium and tin.
但是因為在周期表中這兩個元素之間沒有縫隙，由此門捷列夫提出銦的原子質(zhì)量變?yōu)榻厝徊煌囊粋€值，這樣就可以將其置于鎘和錫之間的空位。
Also， because the molecular motion of a gas depends on temperature， at the low temperatures of the Jovian planets even the lightest gases are unlikely to acquire the speed needed to escape. [TPO 16-3-5]
同時又因為氣體分子運動取決于溫度，所以在類木行星這樣的低溫環(huán)境下，即使是最輕的氣體也無法達到所需要的逃逸速度。
Pluto is not included in either category， because its great distance from Earth and its small size make this planet’s true nature a mystery. [TPO 16-3-2]
冥王星不屬于這兩類中的任何一個，因為它距地球很遠且體積較小，所以目前冥王星的真實形態(tài)仍然是個謎。
because of
The Jovian planets， because of their greater masses and thus higher surface gravities， have higher escape velocities （21-60 kilometers per second） than the terrestrial planets. [TPO 16-3-5]
由于類木行星的質(zhì)量較大并因此產(chǎn)生更高的表面引力，因此，類木行星的逃逸速度（21～60千米/秒）要比類地行星高得多。
be responsible for
Variations in the composition of the planets are largely responsible for the density differences. [TPO 16-3-4]
行星的構(gòu)成成分不同很大程度上是因為密度差異。
account for
Of the various hypotheses attempting to account for the late Cretaceous extinctions， the one that has attracted the most attention in recent years is the asteroid-impact hypothesis first suggested by Luis and Walter Alvarez. [TPO 15-2-5]
各種假說都試圖對白堊紀時期后期物種滅絕做出解釋，近年來Luis 和Walter Alvarez最先提出的小行星撞擊假說備受人們關(guān)注。
Of the various reasons attempting to account for X， the one that has attracted the most attention is A.
which explain why
The disadvantage of using waterpower is that streams do not necessarily flow in places that are the most suitable for factories， which explains why so many water-powered grain and textile mills were located in undesirable places. [6-1-1]