These three methods will pay you, if you are serious about earning extra cash flow.
如果你当真想赚些外快的话，这三种方法还是可行的。
The container should have holes in the bottom so extra water can flow out.
容器底部要留有小孔，以便多余水分的排出。
The thick, tar-like oil requires extra heat to flow.
这种石油浓稠、类似于柏油，要使它流动需要额外的热量。
The thick, tar-like oil requires extra heat to flow.
这种石油浓稠、类似于柏油，要使它流动需要额外的热量。
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