重點講解:
1. large numbers of 大量的
The mud is a feeding ground for large numbers of birds.
泥地是大量鳥類找尋食物的地區
。2. under threat 受到...的威脅
His position as leader is under threat.
他的領導職位受到威脅
。3. be unable to do 無法做...
She is unable to conceive.
她不能懷孕
。4. at the same time 同時...
She looked so beautiful, and at the same time so remote.
她看上去如此漂亮,但同時又那么孤傲
。