Bottom of thread
[機] 螺紋底
?? 詞語組成解析
bottom
['bɑt?m]
n. 底部;末端;臀部;盡頭;
adj. 底部的;
vt. 裝底;測量深淺;查明真相;
vi. 到達底部;建立基礎;
of
[?v]
prep. 關于;屬于…的;由…制成;
aux. 助動詞 [非標準用語、方言] =have [主用于虛擬語氣];
thread
[θr?d]
n. 線;線索;線狀物;螺紋;
vt. 穿成串;將（針、線等）穿過…;用…線縫;給…裝入（膠片、狹帶、繩子）;
??? 情景例句
She has the ability to keep calm in an emergency.
她有處變不驚的本事。
This is not an occasion for laguhter.
現在不是該笑的時候。
But even in the most favourable circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them.
即使是在最有利的環境中，死去的生物中也只有一小部分能在開始腐爛前，或更可能在被食腐動物吃掉之前，被這樣保存下來。