这些准备工作让你不必再担心吃什么，怎么吃，保持健康身体。

They will help you maintain a good health without having to stress yourself too much with the hows and what to eat.

youdao

有了它你就不必再担心向电子邮件之中添加附件，或者单个文件过大而不能使用电子邮件发送。

There is no need to worry about attaching loads of files to e-mails, or about single files being too large to send by E-mail.

youdao

你不必担心找不到最好的资源，先整理些不好的资源，再确定下一步该学什么。

You don't have to worry about finding the best resources, sorting out the bad ones, and figuring out what to learn next. It's all here.

youdao