trouble-free
柯林斯詞典
1. ADJ Something that is trouble-free does not cause any problems or difficulties. 沒有問題的; 沒有困難的
The carnival got off to a virtually trouble-free start with the police reporting only one arrest. 這次狂歡節(jié)開幕進行得幾乎非常順利，警方只報告了一起拘捕案。
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