These changes were gradual and at first scarcely visible.

这些变化是循序渐进的，起初几乎看不出来。

youdao

It had stunk for several days, and at first, I'd thought I was imagining the fishy odor, but it had become more pronounced.

几天来，一直都有臭味，起先，我以为那股鱼腥味是我的幻觉，可是味道越来越明显。

youdao

The Netherlands will still handle the islands' defence and foreign policy, and at first will oversee Curaçao’s debt.

荷兰仍将负责该岛屿的国防和外交事务，首先将监督库拉索岛的债务。

youdao

He began to turn over in the air when his chute opened, and there were problems with the lines at first.

VOA: special.2009.11.24

And at first this was done by Davidson and Germer, and they were American scientists who tried diffracting electrons from a nickel crystal.

这个实验首先是由，美国科学家Davidson和Germer完成的,他们尝试从镍晶体中衍射电子。

麻省理工公开课 - 化学原理课程节选

And at first glance it looks the answer there gotta have to be.

乍一看，好像,答案是肯定的。

耶鲁公开课 - 死亡课程节选

She was prime minister from 1979 to 1990, and at first she alienated almost everybody.

FORBES: Margaret Thatcher, Revolutionary Leader

Lara often expresses disbelief and reluctance through the game and at first, I found this annoying.

FORBES: How Crystal Dynamics' 'Tomb Raider' Empowered Lara Croft

She asked to be his friend online, and at first she worried he wouldn't respond.

CNN: All in the Facebook family: older generations join social networks