Attention must be paid to the working temperature of the machine.应当注意机器的工作温度。而很少说:You must pay attention to the working temperature of the machine .你们必须注意机器的工作温度。此外,如前所述,科技文章将主要信息前置,放在主语部份。这也是广泛使用被动态的主要原因。试观察并比较下列两段短文的主语。
We can store electrical energy in two metal plates separated by an insulating medium. We call such a device a capacitor, or a condenser, and its ability to store electrical energy capacitance .It is measured in farads.