Unit 6Electricity. 短语(词组)1. a moment later一会儿以后moment 可数名词 , 意为”瞬间;片刻”如:Id like to talk to you for a moment.与 moment 相关的短语:a moment ago刚刚;刚才如 :He was here a moment ago.at the moment现在;此刻如 : He is at homeat themoment.wait a moment等一会儿如: Wait a moment, please. later 副词,意为”后来;以后”2. at the moment此时此刻; for the moment暂 时 ; in a moment过一会儿; at any moment 任何时刻3. a packet of一袋不可数名词没有复数形式,在表示数量时,常用“a+ 单位量词 +of+ 不可数名词”结构。如: a