Examples

她正为自己丢失了钱包而懊恼呢。

She's fretting over the loss of her purse.

别人正忙着呢，你别在这儿瞎搀和。

We are busy. Don't hang around interfering.

这件上衣长短正合适。

This coat is just the right length.

果树正茁壮成长。

The fruit trees are growing well.

正齿轮

spur gear

正凑上是个星期天。

It happened to be a Sunday.

这双鞋我穿上大小正合适。

These shoes are just my size.

我们的运动员正处于巅峰状态。

Our athletes are in top form.

正(负)电荷

positive (negative) charge

正电子

positron

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