如果你想从浅色变成深色，你不必等很长时间(而且有时候染发剂的说明书也没有提到这一点。)
If you would like to go from really light to dark, you don't have to leave it on for as long (and sometimes hair dye descriptions fail to mention that).
“你不必出去，也不必在家里等家庭教师。”汤姆说。
"You don't have to go out or wait for a tutor (家庭教师) at home," Tom said.
我想他并非说你不必认真承担责任、工作和对待承诺等，也不是说可以做不正直的人。
I don't think he meant you don't have to take your responsibilities, promises, work, etc. seriously.He didn't mean that it's OK to live life with no integrity.
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