In this paper I first describe the background to the establishment of these zones.

在本文中，我首先描述了建立这些区域的背景。

youdao

These grew out of his own background, in finance, not farming.

这些都源于他的金融(而非农作的)背景。

youdao

In these new style ranges, we leave the foreground and background colors unchanged but set the font style to bold.

在这个新的样式范围中，我们保留前景色和背景色不变，但是把字体样式设为粗体。

youdao

He tells these teenagers the key to being an astronaut is having a solid background in math and science.

VOA: standard.2010.02.02

The background is in these links.

FORBES: Links 2 Nov: Will Apple Rescue Sharp?

These actions can occur in the background while the user is seeing what appears to be a normal, harmless web page.

FORBES: When QR Codes Go Rogue

In all these comings and goings, the army has tried to stay in the background.

ECONOMIST: The riddle of Pakistan