The reaction is not spontaneous.

化学反应不是自然产生的。

youdao

It is not spontaneous, but comes about because someone has planned, planted, or incited it. Typically, it is not a train wreck or an earthquake, but an interview.

媒介事件不是突发事件，但却肯定是有人提前计划、准备或是策划的。一般来说，媒介事件不会是火车事故或者地震，但可能会是一个采访。

youdao

However, according to the researches at present, the technological spillover effect of FDI is not spontaneous, but affected on certain factors such as the absorptive capacity of the host country.

然而，现有研究发现，FDI的技术溢出效应不是自发产生的，它受到东道国吸收能力等相关因素的影响。

youdao

And I think more than that, you may not remember, there was an absolute, unqualified and spontaneous standing ovation for what Mr.Mandela said.

VOA: standard.2010.05.17

Israel was chosen by Yahweh in an act of spontaneous love it does not imply her perfection an act of spontaneous love for the patriarchs.

以色列被上帝选择是出于一种无意识的爱,这并不暗示着她是完美的,只是对族长无意识的喜欢。

耶鲁公开课 - 旧约导论课程节选

So, this is not yet that idealized speech that Kerouac is dreaming of when he writes the list of Essentials for Spontaneous Prose.

所以说，这还不是凯鲁雅克写自发性散文的要素那张单子时,所理想中的语言。

耶鲁公开课 - 1945年后的美国小说课程节选

Buddhist leaders say the riots were not a spontaneous reaction to the alleged Koran insult.

BBC: Bangladesh Buddhists pick up pieces after mob rampage

Land reform was not a spontaneous uprising by black peasants, as Mugabe likes to portray it, Mayo says.

NPR: Under Dictator, Zimbabwe Slides into Chaos

It is clear, however, that the attacks were not a spontaneous outburst of ethnic unrest, but were in fact carefully organised.

ECONOMIST: Refugees start to return, to an uncertain future