He breaks out in a sweat just at the thought of flying.

他一想到飞行，就浑身冒汗。

Her spirits plummeted at the thought of meeting him again.

一想到又要见到他，她的心情便直往下沉。

The girl shuddered at the thought of the dreadful possibilities.

一想到可能发生的可怕的事情，小姑娘就不寒而栗。

She was overwhelmed with fear at the thought of what she had done.

一想到自己所做的事，她就感觉非常害怕。

She was terrified at the thought of being alone.

她一想到孤零零的独自一人就惊恐不安。