Are they confident (at least guardedly so) in success?

他们对成功有信心(至少是被保护着的)吗？

As a clinician, Mukherjee is only guardedly optimistic.

作为一名临床医生，穆克吉仅仅只是抱着谨慎乐观的态度。

The driver nodded guardedly. The rest of us were silent.

司机礼貌的点点头，我们依然沉默的坐着，没有反应。

Smiling guardedly at me, she selected a couple of 16 pomfrets and held them out to me.

她警觉地朝我笑了笑，挑选了两条鲳鱼，捞出水面递给我。

I use the word "Internet" guardedly because I believe in another 18 months or so, we won't be using it at all.

我谨慎地使用“国际互联网”这个词，因为我相信在大约18个月后，就根本不会再使用这个词了。