yī shí jiān

ㄧㄕˊ ㄐㄧㄢ

1for a moment

2momentarily

yì shí jiān一时间wǒ我hái还yǐ wéi以为tā他fēng疯le了。

一时间我还以为他疯了。

For a moment there, I thought he had gone mad.

她一时间拿不定主意，不知如何是好。

Suddenly unable to make up her mind, she didn't know what to do.