Zoom lens a lens whose focal length can be varied continuously over a substantial range.

变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。

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Zoom lens a lens whose focal length can be varied continuously over a substantial range. one zoom lens can replace several fixed focal-length lensed but results are likely to be inferior.

变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。 一个变焦镜头可以代替多个固定焦矩镜头，但效果很可能比不上。

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Zoom lens a lens whose focal length can be varied continuously over a substantial range. one zoom lens can replace several fixed focal -length lensed but results are likely to be inferior.

变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。一个变焦镜头可以代替多个固定焦矩镜头，但效果很可能比不上。

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