in nature/in the nature

in nature 指“在自然界”“实质上”。

1. Baldness that is caused by certain fevers is normally temporary in nature.

由于某些发烧的病症引起的脱发,通常是暂时性的。

2. This argument, vaguely political in nature, took place as soon as the two men met. 那两个人每次见而都要进行这种实质上不明显的政治性的争论。

in the nature of 则是指“具有……的性质(本性)”“按……的本性”：

1. It's not in her nature to do anything rude; she's polite by nature. (LDCE)

办事粗鲁无礼并不是她的本性；她本质上是很有礼貌的。

2. His request was in the nature of a command. (ALD)

他的请求是带有命令性的。

3. The soil is in the nature of chalk.

这土壤具有白垩土的性质。

in no circumstances 见 account $^{2}$

in no time/at no time 见 in no time