个数

The wordwrap() function wraps a string into new lines when it reaches a specific length.

将字符串按字符个数换行。

The uniformity of chloroplast grana lamellae,, the numbers and cristae of mitochondria, and the concentration of nucleus karyolymph were different among different mature grade leaves.

不同成熟度叶超微结构变化显，主要表现在叶绿结构整齐程度、线粒个数和嵴数以及细核核液浓度上。

We will be concerned primarily with bijective proofs, i.e., showing that two sets have the same number of elements by exhibiting a bijection (one-to-one correspondence) between them.

我们主要关心的是对射的，就是透过在两个集合间建立一个对射（一对一且映成的函数）来它们的元素个数相等。