The plural of 'child' is 'children'.

child一词的复数形式是children。

《牛津词典》

The plural 's' is not a free form, as it must always be attached to a noun.

表示复数的s不是自由语素，必须附着于名词。

《牛津词典》

That option is unavailable when the plural is always masculine or feminine in other languages.

在其他语言中，当复数总是阳性或阴性时，就没有这种选择了。

youdao

codexes the plural of this is,is either codexes sometimes, codices I mean,Latin,you'd use the old Latinized plural,codices.

这个词的复数可以是，你可以用旧拉丁语复数。

耶鲁公开课 - 新约课程节选

God ruminates that the humans have become like "one of us" in the plural.

上帝说到人类会变成“我们当中的一个“，时，用的是复数。

耶鲁公开课 - 旧约导论课程节选

All you had to know is the word "Dog" and the plural morpheme 's' and you could put them together to create a word.

你只需知道"狗"这个词以,及复数语素'们',你可以将它们组合在一起来创造出一个词

耶鲁公开课 - 心理学导论课程节选

With these and other sensors and sensemaking tools, the plural of anecdote can truly become data.

FORBES: Moving from Big Data to Big Wisdom

But the plural of anecdote is called data, so I tried the experiment again.

FORBES: The Reusable Cup Experiment

Much the same with global corporations because the plural sector is rooted in community.

FORBES: Henry Mintzberg On What Is Wrong With Our Economy and How To Begin To Fix It