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.

不同成熟度叶片超微结构变化明显，主要表现在叶绿体片层结构度、线粒体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.

我们主要关心射证明，也就透过在两个集合间建立一个射（一一且映成函数）来证明它们元素个数相等。