句子意思:这不是因为自行车贵或人们骑车上班感到累,而是因为路上车子的数量使骑自行车变得更危险.句子结构：It 是主语,is 是表语,because the bicycles are expensive or people feel tired if they ride to work属于表语从句,表语从句中含有两个并列句,由or连接,if they ride to work是people feel tired 的条件状语从句
句子意思:这不是因为自行车贵或人们骑车上班感到累,而是因为路上车子的数量使骑自行车变得更危险.句子结构：It 是主语,is 是表语,because the bicycles are expensive or people feel tired if they ride to work属于表语从句,表语从句中含有两个并列句,由or连接,if they ride to work是people feel tired 的条件状语从句