养蚕是为了得到蚕丝.Silkworm culture is practised in order to get silk.在蚕丝中, 更确切地讲,这些链是反向平行的.In silk, it would be better to describe the chains as being antiparallel.请描述蚕丝与蜘蛛丝的分子结构.Describe the molecular structures of silk and the...
Seeing that he is so young, that is excusable.鉴于他如此年轻, 这是可以原谅的.I then realised that he had made a simple but excusable historical mistake.然后我认识到他犯了一个简单但是可以原谅的历史性错误。It is to be regarded as excusable in the light of circum...