印花税是我国证券市场主要的税种，其主要作用是调整证券市场的行为。
The stamp tax is one of the most important tax items in security markets of our country.
其主要作用不是计算，并且通常对其物理规模有严格的要求(与手持设备一样)。
Their primary role is not computation, and often they have strict requirements regarding their physical scale (as is the case with handheld devices).
气压高度表是一种重要的航空仪表，其主要作用是向载体提供准确的高度数据。
Atmospheric pressure altimeter is an important kind of aeronautical instruments, the main function of which is to offer carrier exact altitudinal information.
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