I have to learn how to live in difficult environments.
我必须学习如何在艰苦的环境下生活。
The control system of a blast furnace is complicated and operates under difficult environments.
高炉控制系统复杂，工作条件较差。
But it has commutator, complex, expensive, difficult to maintain, not suitable for harsh environments.
但它有换向器，结构复杂，价格昂贵，维护困难，不适于恶劣环境。
Under weak signal environments, bit synchronization is very important and difficult in GPS receiver design.
弱信号下的比特同步在GPS的接收机设计中是一个重点也是一个难点。
Under weak signal environments, bit synchronization is very important and difficult in GPS receiver design.
弱信号下的比特同步在GPS的接收机设计中是一个重点也是一个难点。
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