David moved cautiously forward and looked over the edge.

戴维小心翼翼地往前挪，从边缘向下张望。

Cautiously, he moved himself into an upright position.

他小心翼翼地直起了身子。

I am cautiously optimistic that a new government will be concerned and aware about the environment.

对于新政府是否会关注环境问题，我持谨慎的乐观态度。

Rebel sources have so far reacted cautiously to the threat.

到目前为止，反叛分子面对威胁的反应非常谨慎。