Next to habitat loss, these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say.

许多生态学家说，这些入侵物种仅次于栖息地的丧失，是对全球生物多样性的最大威胁。

youdao

The new edition of the dictionary carries 7,000 additions to the language, which purists say is under threat.

新版词典为该语种增加了7000个词条，纯粹派说该语种正受到威胁。

《柯林斯英汉双解大词典》

But geologists caution that while the threat is real, it is impossible to say when the volcano might collapse.

然而地质学家警告说，尽管这一威胁确有其事，但是根本无法断定火山何时崩塌。

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Experts say the Arctic sea ice extent is under threat.

VOA: special.2009.10.27

Yemeni officials say the international funding is not nearly enough to combat poverty, which they say is the real security threat in Yemen.

VOA: standard.2010.04.20

But analysts say such a threat does not carry the weight it once did in Turkey.

VOA: standard.2009.10.15

And also, Britain's initial attempt -- their threat to say that they could go in and retrieve Assange from the embassy?

WHITEHOUSE: The White House

Many plants are also under threat, say the IUCN.

CNN: Western black rhino declared extinct

Some leftist lawmakers, Mexican contractors and even some foreign oil-service firms that work with Pemex on a fee basis might see change as a threat, analysts say.

WSJ: Mexico Sees Energy as Key to Reset Economy