19. At will:任意地
In a society like ours, one has to be law-abiding and not to do things at will.
20. At ones wits end:不知所措
Chased by the enemy to an abyss, the man could not advance any more, nor could he retreat; he was at his wits end.
21. At heart:在内心里;本质上
a. A good leader often has the peoples interests at heart.
b. Though Xiao Gan works in a city, he is a country boy at heart.
22. At sixes and sevens:乱七八糟
When the maid returned to work after three days leave, she found all the rooms at sixes and sevens.
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