您要查找的是不是：
- He is at home with this subject. 他熟悉这一学科。
- He is at an absorbing thriller and can't be disturbed. 他正在阅读一部引人入胜的惊险小说，什么也惊动不了他。
- Don't expect much of him; he is at best a student. 不要对他期望过高; 他只不过是个学生。
- Don't scold him too much; he is at best a child. 不要太责骂他; 他只不过是个孩子。
- One should never be arrogant even when he is at his best. 一个人在最得意时也不应傲慢。
- He is at last the proud possessor of a driving licence. 他终于获得了驾驶执照，这使他颇为得意。
- I wonder what he is at by doing so. 我不知道他这样做是什么意思。
- He is at heart an ardent reformer. 他实际上是个极热心的改革者。
- The boss will see you as soon as he is at liberty. 老板一有空就会接见你的。
- He is at a loss how to cut the knot. 他不知如何才能大刀阔斧地解决这一难题。
- He is at the top (bottom) of Fortune's wheel. 他时运极佳（坏）。
- He is at the bottom of the class. 他是班上的最后一名。
- Can you make sure that he is at home? 你确定他在家吗?
- He is at grips with civil architecture. 他在钻研民用建筑学。
- I doubt whether [if] he is at home. 我看他不一定在家。
- He is at enmity with his neighbours. 他与邻人不和睦。
- Do not expect much of him; he is at best a student. 不要对他期望过高; 他只不过是个学生。
- Do not scold him too much; he is at best a child. 不要太责骂他; 他只不过是个孩子。
- He is at once a stateman and scientist. 他是一位政治家，同时又是一位科学家。
- He is at the zenith of his fortune . 他正处在事业的颠峰状态。
