A different method is usually employed for welding sheets or plates of metal together, which is known as spot welding.

5) 燃料燃烧时所需要的空气，用空气喷射器或风机经炉篦吹入。进去的空气量，正好绰绰有余地供给燃料完全燃烧。

The air which is needed by the fuel for combustion is blown across the firegrate by air jets or fans, making the amount of air which is allowed to enter just more than sufficient for the complete combustion of the fuel.

6) 一个结构物受到的荷载可以分为静载和活载两种。静载包括该结构物各部分的重量。活载是由于人，可移动的设备等等的重量所造成的。

The loads a structure is subjected to are divided into dead loads, which include the weights of all the parts of the structure, and live loads, which are due to the weights of people, movable equipmant, etc.

7) 承受的荷载和轴心线成直角的是径向轴承。承受的荷载和轴心线平行的是止推轴承。这是现代机器使用的两种主要轴承。

Radial bearings, which carry a load acting at right angles to the shaft axis, and thrust bearings, which take a load acting parallel to the direction of shaft axis, are two main bearings used in modern machines.

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