n.

something that is a source of danger

"earthquakes are a constant threat in Japan"

同義詞：menace

a warning that something unpleasant is imminent

"they were under threat of arrest"

declaration of an intention or a determination to inflict harm on another

"his threat to kill me was quite explicit"

a person who inspires fear or dread

同義詞：terrorscourge

Modeling Security Threats
Present and future arboviral threats
Global threats to human water security and river biodiversity
Global threats to human water security and river biodiversity.
Attack trees : Modeling security threats
Antibiotic resistance threats in the United States, 2013.
Antibiotic resistance threats in the United States, 2013.
Assessing Extinction Threats: Toward a Reevaluation of IUCN Threatened Species Categories
Erratum: Global threats to human water security and river biodiversity (Nature (2010) 467 (555-561))
Freshwater biodiversity: importance, threats, status and conservation challenges.