The essential gears and electronics come in a prebuilt base, and attaching the arms takes an hour or so.

其主要的齿轮与电子调配是厂商预先装备好的，而为其安装上四肢大概需要花费用户一个小时左右的时间。

Prefer overriding the base class implementation to attaching an event handler.

优先考虑重写基类的实现，而不是事件句柄。

An active device mount 1 comprises a base 2 having a forward face with a connecting means 3 for attaching an optical fiber connector.

活跃的设备安装1包括一个基地，2，因与手段附加连接的光纤连接器三前锋的脸。