The legislation will be difficult to enforce.

这一法规将难以实施。

《牛津词典》

In practical terms this law may be difficult to enforce.

从实际的角度来看，这项法律可能难以执行。

《牛津词典》

But these laws are fiendishly difficult to enforce, says Mr Farrow.

然而据法罗说，这些法律执行起来困难重重。

youdao

But the U.S. EPA has rejected that idea, calling it impractical and difficult to enforce.

FORBES: Clearing the Air

However, as well as being difficult to enforce, the proposal faces resistance from the industry.

BBC: Does the cruise industry need regulation?

We were left holding a useless piece of paper, and it's difficult to enforce a contract there.

FORBES: Magazine Article