bottom margin的用法和樣例：
例句
- The carpenter shaved off a small amount from the bottom of the door to make it close properly.
木匠將門底邊刨去了一點使它正好關上。 - The curious compact cometary shape near the bottom edge is Hubble's Variable Nebula.
影像底邊緊湊而又奇怪的彗星狀天體就是哈勃的變光星雲。 - But the bottom line seems clear.
但其底線應該是清楚的。 - Are those bottom lines are you concessional without method?
那些底線是你們沒有辦法讓步的？
