...of mass loss. 请问,老师这里用blowing 不用blew 是因为blow的这个用法吗(of air, wind, etc. : to move with speed or force)?,这里的a stream of charged particles和风是同一种“物质”,他们会自发的移动,而不是被吹。off表示离开的意思。
...re taught as soon as your Children can understand what you're saying.When your children do something right,let them know.When your children do something wrong,tell them how they should do it and why.Here are some basic manners for children:1.Wait for their turn and don't interr...
...是不应该用introduce,而应用describe。我认为“for the first time”是introduce非常重要的一个要素,不知这观点是否正确。我想这也是http://www.yygrammar.com/Article/201108/2474.html中说【“介绍某学校”“介绍某国家”“介绍某机构”等场合使...
...rs compose poems or paintings under the pine trees.请问加第二个逗号的原因是什么?fishermen fish on the lake和famers hew or collect herbs on the hills都是完整的句子,为什么能用逗号隔开呢?谢谢老师!