忍不住 : can't help oneself doing something 这部电影实在是太感人了,小花忍不住哭起来了。
受不了 : can't stand something 他最后还是受不了他那野蛮的上司。
不仅...还/而且 : not only .. but also 她不仅学习成绩好,而且性格也很好。
18 avril 2016
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忍不住 = cannot endure from inside or internal factors
受不了 = cannot endure from external factors.
As for 不仅 = not only but from your context, you used the wrong character, 緊. 不緊, literally = not tight, figuratively = no problem