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重点讲解：
1. at least （数量）至少，不少于；
例句：He has been there at least twice.
他至少去过那儿两次。
2. to no avail 毫无用处；没效果；
例句：His efforts were to no avail.
他徒劳无功。
3. for the first time 首次；第一次；
例句：Ten years ago, I went to the tropics for the first time.
十年前我第一次到热带去。
4. according to 据…所说；按…所载；
例句：According to the old legend, Romulus was the founder of Rome.
按照古老的传说，罗穆卢斯是古罗马的建国者。
adj. 未经解释的；未经说明的；不清楚的
