Titanium in the pure state can exist in either of two allotropic forms.纯钛以两种同素异形的形式存在.Carbon and sulfur and phosphorus are allotropic elements.碳、硫磺和磷是同素异形元素.Ozone ( O 3 ) is allotropic form of oxygen ( O 2 ) with three a...
她有时在伦敦过周末.Every so often, she takes a weekend in London.海伦在她叔叔家过周末.Helen passed her weekend at her uncle's.想让我们的生活步调保持一致好一起去度假和过周末几乎是不可能的事。It was virtually impossible to synchronise our lives so as to take holidays ...
休穿戴整洁地上班去了。Sue had dressed herself neatly for work.孩子们必须学会整洁地写字.Children must learn to write neatly.所有的数据必须明白地和整洁地记录在直列和横列中.All data must be recorded legibly and neatly in straight rows and columns....