make sure these circumstances apply to...请问这句话的意思,并分析其结构,make sure these circumstances apply to you before you decide not to wear your seat belt
问题描述：
make sure these circumstances apply to...请问这句话的意思,并分析其结构,
make sure these circumstances apply to you before you decide not to wear your seat belt
答
在你决定不系安全带前请确定当时周围的环境。
答
在你决定不系安全带之前，一定要确保环境对你没问题。
答
在你确定对周围的环境游刃有余的前提下才可以决定不系安全带.
这是个时间状语从句：before you decide not to wear your seat belt是句子中的状语从句
答
确保这些情况适用于你在你决定不系安全带