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at fault（有责任，有错误），at heart（在内心里），at it（积极地干），at leisure（有空闲；从容地），at liberty（自由，有权做某事），at one stroke（一下子），at one’s fingertips（熟悉，精通），at one’s service（听……差遣；供……使用），at sea（茫然，不知所措），at stake（在危险中，处于成败关头），at sixes and sevens（乱七八糟，意见分歧），at will（任意地，随意地）。
例句：At this point your logic is at fault.（在这一点上你的推理是错误的。）
Though he has a solemn face, he is very humorous at heart.（虽然他有一副严肃的脸孔，但内心却很富幽默感。）
His rule for success was to keep always at it.（他的成功法则是总是努力干。）
I’ll take the report home and read it at leisure.（我把报告带回家去慢慢看。）
Everybody is at liberty to air his views.（每个人都有发表意见的自由。）
He has all the information at his fingertips.（他对所有的信息了如指掌。）
My entire staff is at your service.（我全部的员工都听你差遣。）
He felt completely at sea in his new school.（他在新学校中感到茫然不知所措。）
The life of the sick man is at stake.（病人的生命危在旦夕。）
My mother said that my bedroom was at sixes and sevens.（我妈说我的房间乱七八糟。）
The animals are allowed to wander at will in the park.（这些动物可以在公园里随意走动。）
例句：At this point your logic is at fault.（在这一点上你的推理是错误的。）
Though he has a solemn face, he is very humorous at heart.（虽然他有一副严肃的脸孔，但内心却很富幽默感。）
His rule for success was to keep always at it.（他的成功法则是总是努力干。）
I’ll take the report home and read it at leisure.（我把报告带回家去慢慢看。）
Everybody is at liberty to air his views.（每个人都有发表意见的自由。）
He has all the information at his fingertips.（他对所有的信息了如指掌。）
My entire staff is at your service.（我全部的员工都听你差遣。）
He felt completely at sea in his new school.（他在新学校中感到茫然不知所措。）
The life of the sick man is at stake.（病人的生命危在旦夕。）
My mother said that my bedroom was at sixes and sevens.（我妈说我的房间乱七八糟。）
The animals are allowed to wander at will in the park.（这些动物可以在公园里随意走动。）
