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.

不同成熟叶片超微结构变化明显，主要表现在叶绿体片层结构整齐程、线粒体个以及细核核液浓。

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.

们主要关心的是对射的证明，也就是透过在两个集合间建立一个对射（一对一且映成的函）来证明它们的元素个相等。