semiautomatic ground environment

例句：

1. 1. The new car has a semiautomatic gearbox.
   这辆新车有一个半自动变速器。
2. 2. The machine is semiautomatic, so it can be operated by one person only.
   这台机器是半自动的，只能由一个人操作。
3. 3. The semiautomatic gun is very effective in close combat.
   这种半自动枪在近战中非常有效。