A number of problems marred the smooth running of this event.

许多问题破坏了该事件的顺利进行。

《柯林斯英汉双解大词典》

Those produce a large number of faint reflections in what's called as: a smooth of echo.

这些（松针并不茂密的松树）能产生大量微弱的反射，我们称之为“平滑回声”。

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XML happily permits a number of errors that, although not sufficiently grave to cause a software fault, nevertheless impede smooth reading.

XML允许许多问题存在，这些问题尽管不足以导致软件故障，但会影响流畅的阅读。

youdao

One problem has been turning number crunchers into smooth salesfolk.

FORBES: H&R Blocked

But Dr Foster medical guide editor, Alex Kafetz, said that figure was only an average and the number of patients using beds was "not particularly smooth" and more needed to be done to make sure patients who potentially should not be in hospital were cared for at home or at specialised care facilities.

BBC: Full hospitals creating potential danger, analysis says