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变体;变种;变化形式
A variant of a particular thing is something that has a different form to that thing, although it is related to it.
例句
The quagga was a strikingly beautiful variant of the zebra...
斑驴是一种极美丽的斑马变种。
An intriguing variant to pipelines would be to carry the water using the existing system of canals...
除用管道外，利用现有的运河系统来输送水也很值得一试。