be on
动词- To be performative or funny in a wearying manner. · You don't have to be on all the time.
- To be responsible for (something). · That task is on you.
- To be up to; to be engaged in or scheduled to do imminently. · What are you on today?
来自图书馆
“As if it wasn’t trouble enough hatching the eggs,” said the Pigeon; “but I must be on the look-out for serpents night and day!
“I thought the little rascal wouldn’t be on hand,” chuckled Anthony.
“I’ll be on my way.
However little known the feelings or views of such a man may be on his first entering a neighbourhood, this truth is so well fixed in the minds of the surrounding families, that he is considered as the rightful property of some one or other of their daughters.
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