In return, the acacia feeds the ants a protein from its leaflets and nectar from its stalk.

作为回报，洋槐树的叶片会分泌一种蛋白质，连同它的主茎分泌的香甜汁液一起供蚂蚁食用。

youdao

The mosquitoes mostly live on flower nectar, but the female of the species needs a meal of human blood to have enough protein to lay her eggs.

蚊子大多以花蜜为生，但是雌性蚊子为了产卵，需要吸人血来提供充足的蛋白质。

youdao