马克自告奋勇
Mark volunteered
以上为机器翻译结果，长、整句建议使用 人工翻译 。
于是马克自告奋勇一早一晚坐公车接送，直到她可以一个人应付。
Mark volunteered to ride the bus with Susan each morning and evening until she got the hang of it.
youdao
于是马克自告奋勇早晚与她一起坐公车，直到她习惯了坐车为止。
She used to take the bus, but she was now too frightened to get around the city by herself.
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