It's rude not to open a present when someone gives you one.

当有人送给你礼物时，你不打开是不礼貌的。

youdao

It has a gate on it and that gate is in open or close state depending on whether a ligand is present or not.

在这个通道上有个门,这个门是打开还是关闭,取决于配体到来与否

耶鲁公开课 - 生物医学工程探索课程节选

The new pool of data would be open to abuse and present a security threat.

BBC: Computer keyboard and mouse

For a brief period, starting in the early 1990s and ending in the late 2000s, there was a widespread belief that the internet ought to stay open, allowing anyone with a good idea to present it online and have it evaluated based on its own merit and not on the size of the wallet supporting it.

FORBES: The Internet Is Drowning

Your aging parent(s) have the potential to suck you into a financial hole but you avoid having an open, non-confrontational discussion (possibly with a professional present) to address these issues.

FORBES: 13 Financial Risks You Can Avoid