Each product has a number for easy identification.
每件产品都有号码以便于识别。
The identification was quite easy.
这种识别很容易。
In practice the identification of lines in a star's spectrum is not so easy.
实际上，要辨认恒星光谱中的谱线并不那么容易。
In practice the identification of lines in a star's spectrum is not so easy.
实际上，要辨认恒星光谱中的谱线并不那么容易。
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