The cogs gear smoothly.齿轮啮合得很好.These executives, expert in every phase of corporation, became the indispensable cogs in the industrial machine.这些高层管理人员精通公司的各项业务, 成为整个工业机器中不可缺少的齿轮.Today's young people are being forge...
我可不是开玩笑,事情够麻烦的了.I'm serious, things are difficult enough as they are.更麻烦的是，每个人对维生素的需求量是不同的。To complicate matters further, everybody's vitamin requirements vary.买房子会是件很麻烦的事。Buying a house can be a very tiresome ...
These stacks of thylakoids are called grana.这些成堆的类囊体称为质体基粒.With the light microscope these stacks are just visible as grains ( grana ).可以用光学显微镜观察到这些堆积成颗粒状的物质 ( 质体基粒 ).The chloroplasts in the swamp reed were round - shape...