细心不苟；严肃认真；谨慎careful

• 对这个问题要特别慎重。

  One should be especially prudent when dealing with this problem.

• 这一问题有待慎重研究。

  Careful research remains to be done on this issue.

• 处处慎重

  cautious in all respects

• 慎重考虑

  careful consideration