at

中文： 向、在

1. In, near, or in the general vicinity of (a particular place). · Caesar was at Rome.· A climate treaty was signed at Kyoto in 1997.
2. Attending (an educational institution). · She's at Oxford University, studying chemistry.
3. Working for (a company) or in (a place or situation). · He used to be at Lehman Brothers. Now he's at Merrill Lynch.· 'Where does he work?' — 'I think he's still at the solicitors.'
4. Indicating distance or direction relative to the speaker. · Target at five miles. Prepare torpedoes.· Look out! UFO at two o'clock!
5. Present or taking place during (an event). · Was he at the meeting?· There was a big fight at the class reunion.
6. Indicating time of occurrence, especially an instant of time, or a period of time relatively short in context or from the speaker’s perspective. · at six o’clock; at dawn; at closing time; at the age of twelve; at night; at the moment
7. In the direction of; towards; (often implied to be in a hostile or careless manner). · Don’t just talk at someone; really listen to what they have to say.· Stones were thrown at us, but we couldn't see who did.
8. Indicating action bearing upon something, especially continued or repeated action. · Don't pick at your food!· My cat keeps scratching at the furniture.