He was cautious of his footing, wary of the edge.

他小心翼翼地站稳，注意着边缘。

She was cautious of strangers.

她对陌生人很警惕。

She is cautious of telling secrets.

她很谨慎，不会泄露秘密。

I can't be too cautious of the deal.

这单生意我怎么谨慎都不为过。

Tencent has so far been the most cautious of the three.

至今为止，腾讯是三家公司中最谨慎的一个。