Butterflies feed on a sweet liquid produced by flowers.
蝴蝶以花朵产生的甜液为食。
Butterflies feed on a sweet liquid produced by flowers, which bees and other insects collect.
蝴蝶以花蜜为食，蜜蜂和其他昆虫收集花蜜。
The fermented liquid feed has been used widely in Europe, and there is an increasing interest on this subject.
发酵液体饲料在欧洲已广泛使用，并成为当前人们研究的新热点。
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