A cell is the basic unit of life. 细胞是生命的基本单位。 A cell is the smallest str...

A cell is the basic unit of life. 细胞是生命的基本单位。 A cell is the smallest str...

Civil wars are fought between citizens of the same country and are fough...

Honey bees are social insects that live in colonies. 蜜蜂是群居的昆虫。 A bee col...