Sentence examples for are difficult to pin down from inspiring English sources

Atoms zip around at lightning speeds and are difficult to pin down at ambient temperatures.

What's more, centaurs' orbits are difficult to pin down precisely and are thought to be unstable.

Of course, the precise mechanisms here are difficult to pin down, and the researchers acknowledge that other factors besides communication and trust could be at play.

Rates of secondary infertility are difficult to pin down, because couples often feel guilty seeking treatment when they already have a child, or they are told that their previous fertility proves that nothing is wrong.

Precise numbers of disappearances are difficult to pin down, human rights advocates say, partly because family members fear that reporting missing relatives could endanger the relatives or even themselves.

Unfortunately, the statistics show that these are the least successful reasons for launching reorgs, perhaps because the tangible benefits of these objectives are difficult to pin down and translate into a series of actions.

It's difficult to pin down why.

This difference may be difficult to pin down, but see semantic properties below for some discussion.

It's difficult to pin down the current state of Bloc Party.

From the start, it has been difficult to pin down — even for its members.

It is difficult to pin down quite what roles Johnson has made his own.