... hard strong coke 硬焦炭 walk hard but also strong 走得辛苦 却也坚强 its hard enough for me 硬就好 ...
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hard strong coke
硬浓焦
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Pressure system in coke oven gas-collecting pipe is a multi-coupling, nonlinear, strong disturbed, multi-variable and time-varying system. It is hard to control it in usual methods.
集气管压力系统是一个耦合严重、非线性、扰动频繁剧烈的多变量时变系统，很难用常规方法加以控制。
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