The nature of compound statements introduced the nature of proper indentation in Python programs, which makes Python programs easy to read and understand.

复合语句的特性引入了Python程序中的适当缩进特性，这使得Python程序易于读和理解。

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Thus, when the elements lead and sulfur are combIned In the proper proportion, they form a compound called lead sulfide.

因此，当铅和硫以适当的比例结合在一起时，它们便形成了一种叫铅硫化物的化合物。

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Using industrial fly-ash wastage and slag as main raw materials, appending proper proportional homemade compound activator, we have prepared the cement gelatin material.

采用工业废渣粉煤灰和矿渣为主要原料，通过掺加适当比例的自制复合活性激发剂，配制和研究高掺量粉煤灰矿渣水泥胶凝材料。

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