I saw him bow his head uncertainly before he came to power.

我看到他上台前不自信地低着头。

I shook my head at him uncertainly.

我不确定地对他摇摇头。

I put forward my request to him uncertainly.

我没把握地向他提出了我的请求。

They smiled uncertainly at one another.

他们犹豫地相视而笑。

He entered the hallway and stood uncertainly.

他走进门厅，站在那儿不知道做什么好。

"Hello," he said uncertainly.

“你好，”他迟疑地说。

"You never know, " she replied uncertainly.

“难说，”她没有把握地应答了一声。

Chris Something is smiling at me uncertainly.

那个什么克里斯迟疑地向我微笑。