First off we are going to create a mask on the landscape image.

首先，在风景图片上创建一个蒙版。

youdao

So first off we know Web 2.0 has a very vauge technical deffenition such as it’s new media or it’s sharing info or media etc..

首先我们知道web2.0有很多技术定义，比如新媒体或者分享信息或者媒体等等。

youdao

We can stop off in Tsim Sha Tsui and get something to eat first.

我们可以先在尖沙咀停下来吃点东西。

youdao

But first,we help send off the college graduates of two thousand ten.

VOA: special.2010.05.28

All right. So, let's pick up where we left off, first of all we're still on the hydrogen atom from Monday.

好，让我们从上次停下的地方讲起，我们还要讲周一讲的氢原子。

麻省理工公开课 - 化学原理课程节选

We're off because our downbeats, our strong pulses always have to come on the first part of the bar, this note.

我们做错了,因为我们的重拍,我们的强拍,总是在每个小节的第一拍的那个音

耶鲁公开课 - 聆听音乐课程节选

First off we should start with the fact that U.S. extraterritorial taxation renders many of the tax laws of your land of residence null and void.

FORBES: Relinquishing U.S. Citizenship

And, Carlotta, first off, we should mention this was a traffic accident.

NPR: Afghan Capital Calm After Deadly Riots

When we first heard MSI was showing off a device at CeBIT called the S30, we assumed it was the successor to the S20, the company's first Windows 8 Ultrabook.

ENGADGET