I just wanted to make sure the room would be very clean at first sign.

我只是想要确保房子的每一个角落一眼看过去是很干净的。

youdao

At first sign in lobby, Fireproof Brick were used to the wall, Reduction Firing Brick to the ground, and figured glasses on arched Windows.

走进大厅第一眼看到的是由防火砖砌成的墙体，耐火砖铺设的地面以及拱窗上的压花玻璃。

youdao

At the first sign of trouble, the crowd melted away.

人群一看有麻烦，便渐渐散了。

《牛津词典》

He said they would rise up at the first sign of a leader who wished to break their chains.

VOA: special.2009.06.18

So, what I want to do is, I want to discuss the scientific notion of language, at first restricting myself to systems like English and Dutch and American sign language and Navajo and so on.

因此,我想做的是,我想来谈谈语言的科学定义,首先我会将自己限定在,诸如英语,荷兰语,美国手语,或迪瓦霍语等语言系统之下

耶鲁公开课 - 心理学导论课程节选

In April,after the first cases in the United States, officials told schools to close at the first sign of an H1N1 outbreak.

VOA: special.2009.08.05

At the first sign of a strengthening dollar, you should sell the bond, she says.

FORBES: The Global Test

Those businesses will have capital to reinvest at the first sign of market recovery.

FORBES: Top 10 Industries: Growing Margins in Growing Uncertainty

And don't ask for a raise at the first sign of your company's turnaround.

WSJ: It Can Be Done: Landing a Raise In a Recession