Every year new strains of influenza develop.

每年都有新的流感病毒出现。

柯林斯例句

Cloning may also bring about new strains of livestock.

克隆技术也能培育家畜的新品种.

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These new strains of kelp are better adapted to the higher temperatures of Chinese coastal waters.

这些新品种的海带较能适应中国海边较高的水温.

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