It has an instant effect on your body chemistry.

它会对你体内的化学物质产生立竿见影的效果。

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This medicine produces an instant effect.

这药吃下去就见效。

《新英汉大辞典》

This approach makes use of the "waterfall effect" well-known in journalism where writers try to give their readers an instant idea about the topic they're reporting.

这种方式使用了新闻业中著名的“瀑布效应”，新闻作者试图让他们的读者即时知道他们的报道的主题。

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The moment Old Trafford had been waiting for arrived after 65 minutes when Ferguson unleashed Ronaldo - and the effect was instant.

BBC: Man Utd 0-0 Villarreal

Mechanical looms, steam- powered locomotives, gasoline engines, electric motors ? none had an instant effect on productivity.

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