set a standard 设定一个标准 set...free 释放... set an example to sb树立榜样 set aside 留出,拨出 set off 动身,出发;燃放,使爆炸 set out 动身,出发 set out to do 开始,着手 set up 建立,开办 The sun has set.太阳西沉。
281. It was raining heavily and they found that a stream had formed in the field. 雨下得很大,他们发现地上已经形成了一条小溪。 282. The stream wound its way across the field and then flowed right under their tent! 那小溪弯弯曲曲...