Apparently most massive stars manage to lose sufficient material that their masses drop below the critical value of 1.4 M before they exhaust their nuclear fuel.
顯然，大多數(shù)的巨星能夠失去足夠多的物質(zhì)以至于在燃盡其核燃料以前他們的質(zhì)量下降到關(guān)鍵值1.4M以下。難在：sufficient ……that…… = so much (many ) …… that……