It's necessary for them to support each other before and during the event.
在活动之前和活动中相互支持是很有必要的。
It is necessary for you to support and help each other before and during the event.
在活动之前和活动期间你们互相支持和互相帮助很有必要。
It is necessary for you to support and help each other before and during the event.
在活动之前和活动期间你们互相支持和互相帮助很有必要。
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