Being very small, atoms cannot be seen by ordinary methods.

由于原子太小，用普通方法就不能见到原子。

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To count the stars in the Milky Way by ordinary methods would take more than a lifetime.

如果用普通方法来数银河系里的星星，那你一辈子也数不清。

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The shape of the Simplex stern tube seal ring is so complicated that its characters can not be analysed by ordinary methods.

船舶尾轴的辛泼来克司密封环形状非常复杂，用一般方法难以进行分析。

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