When enough cholesterol has been made, a sensing mechanism alerts the cell to turn off this enzyme . 当制造的胆固醇够用了，有个自动检测机制就告诉细胞将这个酶关掉。
The large majority of the colors produced by nature and men have these nuclei as essential components . 天然的和人工制造的绝大多数色素都有这类核作为其主要组成部分。
The subject now before us is the construction of the gun, its length, its composition, and its weight . 我们现在要研究的是我们将要制造的大炮，它的长度、构造和重量。
From the english side rumors of a major allied action in northern norway are being deliberately started . 从英国方面获悉，盟军在挪威北部采取重大行动的谣言是有意制造的。
Digestive enzymes manufactured in six gastric glands (caeca) are secreted into the stomach to carry out this function . 六个胃腺（盲囊）制造的消化酶分泌到胃中执行这种功能。
Perched on the shoulders of the booster is the second stage, the most powerful hydrogen-fueled rocket ever built . 放在助飞火箭上的是第二节，那是迄今制造的最强大氢燃料火箭。
our main concern will be with single crystals deliberately prepared and of a size greater than about 1 m. 我们研究的主要是人工制造的体积大于1m左右的单晶。
Most of the finishes used for "wash and wear" and "permanent press fabrics" are manufacture from urea, etc. compounds . 大多数“洗可穿”和“耐久熨烫”整理剂是由尿素等其他化合物制造的。
The sparker was originally developed for fundamental studies of underwater sound propagation and of subbottom geology . 火花发生器原来是为了进行关于水下声波传播及海底地质的基础性研究而制造的。
All automobile engines now built are equipped with the positive-crankcase ventilation system of crankcase emission control . 所有现代制造的汽车发动机，都需要装备控制曲轴箱有害污染的曲轴箱强制通风系统。
