trouble-free
柯林斯词典
1. ADJ Something that is trouble-free does not cause any problems or difficulties. 没有问题的; 没有困难的
The carnival got off to a virtually trouble-free start with the police reporting only one arrest. 这次狂欢节开幕进行得几乎非常顺利，警方只报告了一起拘捕案。
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