I'll admit spring cleaning is a difficult notion for modern families to grasp.
我承认春季大扫除对现代家庭来说是个很难理解的概念。
Cleaning the inside of a laptop computer can be a difficult task.
清洗一台笔记本电脑里面可以是一个艰巨的任务。
Cleaning of gas is difficult and Labour intensive process.
天然气清洁是困难的，劳动密集的过程。
The cleaning of water scale for shell side cooling equipment was very difficult.
壳程水冷设备的水垢清洗很困难。
The cleaning of water scale for shell side cooling equipment was very difficult.
壳程水冷设备的水垢清洗很困难。
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