Undeliverable
a. 無法投遞的, 無法送達的
??? 情景例句
I'm afraid I'm a poor talker.
我這個人恐怕不善言談。
What do you think I should do?
你想我該怎么做呢？
It's Jim. He's in that tree. He can't get down. Can you help him?
是吉姆，他在樹上，下不來了，你能幫他嗎？