Make sure that snow has not blocked the exhaust pipe.

确保没有积雪堵塞排气管。

youdao

Check that the remote FTP port is not blocked.

确认远程FTP端口没有阻塞。

youdao

Checkpoints are not blocked by the defragmenter.

检查点没有被碎片整理程序阻塞。

youdao

The Saudi Communications and Information Technology Commission did not say what services would be blocked.

VOA: special.2010.08.06

And the reason that they're the least sheilded is because they can get closest to the nucleus, so we can think of them as not getting blocked by a bunch of other electron, because there's some probability that they can actually work their way all the way in to the nucleus.

它们最不容易被屏蔽的原因,是因为他们可以更加接近原子，所以我们可以认为它们,最不容易被其它原子阻挡住，因为它们有一定的概率,离原子核非常近。

麻省理工公开课 - 化学原理课程节选

Security is a constant concern, and that means both protecting customer accounts and making sure they are not blocked unnecessarily.

FORBES: Wells Fargo Goes DIY In Building Business Banking Services

Evernote is not blocked in China, unlike a host of other Western companies such as Facebook, Twitter, Google Drive and Foursquare.

BBC: Evernote will set up a data centre in China

Unlike light waves, radio waves are not blocked by the dust clouds.

BBC: By BBC News Online Science Editor Dr David Whitehouse