at a touch
youdao
我的肚子一碰就痛。
My tummy felt very tender.
《柯林斯英汉双解大词典》
它们大多非常脆弱，一碰就会损坏。
Most of them are extremely delicate and can be damaged by a simple touch.
And the first thing you do is ask is it an instance of some problem that other people have already solved?
而且你以前从没碰过这个问题,你首先要做的一件事就是问问自己,这是不是一个别人已经解决了的问题？
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