At first I thought he was shy, but then I discovered he was just not interested in other people.

起先我以为他腼腆，后来才发现他对别人没兴趣。

《牛津词典》

At first I thought he was stealing valentines from Michael Rogers's box.

一开始我以为他在偷迈克尔·罗杰斯盒子里的情人节礼物。

youdao

At first I thought of buying you a fountain pen, but you've already got one.

开始我想到给你买支钢笔，不过你已经有一支了。

youdao

At first I thought the city was empty. The buildings all were empty and in poor repair.

VOA: special.2010.07.17

So, it seemed like a good start for me, pre-med/bio, and I signed up for my bio class -- I found out, as Professor Drennen did, that I had to take chemistry as well. I wasn't as upset, I was sort of a neutral chemistry person at this point, but I thought it was pretty smart to get it over with on the first semester, so that's what I did.

一个既在科学上有挑战又能帮助他人的职业，从医学预科或者生物起家-,我参加了生物课，我和Drennen教授一样，我也必须要上化学课，我并没有很不爽,我当时对化学的态度很中立。

麻省理工公开课 - 化学原理课程节选

After Gatsby's death,Nick Carraway, the storyteller,says: "I thought of Gatsby's wonder when he first recognized the green light at the end of Daisy's boat dock.

VOA: special.2010.11.28

At first I thought I ought to prepare--to read articles on school vouchers and interview experts.

CNN: Talking Race With The President

"Caller ID was blocked, so at first I thought it was a telemarketer, " his message joked.

WSJ: SpaceX Craft Rehearses Moves

At first I thought it might actually be too hard for my poor Monk.

FORBES: Connect