He received a threatening letter.

他收到一封恐吓信。

youdao

A McCain campaign office received a threatening letter containing an unidentified powder.

麦凯恩竞选办公司收到了一封含有未经确认粉末的威胁性。

youdao

A McCain campaign office received a threatening letter containing an unidentified powder. Authorities say the substance wasn't dangerous, and they already have a suspect.

麦凯恩的竞选办公室收到内涵不明粉末的信函的威胁，官方表示这些物质没有危险，而且他们已经确定了嫌犯。

youdao

Dorner claimed Williams was harassing him and sent a threatening letter to his home.

NPR: Court File: LA Ex-Cop Was Disturbed, Self-Obsessed

In 1967, the year Lillehei left Minnesota to become chief of surgery at New York Hospital-Cornell Medical Center, the IRSsent a threatening letter.

FORBES: The IRS Gets a Doctor

David Siegel, the founder and CEO of Westgate Resorts, sent a threatening letter to his employees indicating that he might fire all of them if Republican nominee Mitt Romney was not elected.

FORBES: Cain Uses Non-Profit to Stump for Romney, Says 'Stupid People Are Ruining America'