act at once ; immediate action
我们必须立刻行动 We must act at once ; We must act now ; We must take immediate action
让我们立刻行动起来 Let us act at once ; Let us act now
youdao
假若你已经结婚，也许就立刻行动买起来。
Well, if you were married, you'd probably own it by now.
一旦你决定要吻这个人，看准时机就立刻行动。
Once you have decide you are going to kiss someone, choose your moment and go for it.
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