In addition, environmental pollution, a major natural disaster, major infectious diseases and other non-traditional security problems remain serious.

此外，环境污染，重大自然灾害，重大传染性疾病等非传统安全问题依然严重存在。

youdao

Authorities said a major environmental disaster was unlikely as the swift current dispersed the oil.

NPR: Oil Leak: Miss. River At Vicksburg Remains Closed

Staff at the station were subsequently honoured for preventing a major environmental disaster.

BBC: Ascania

In its investigation of the explosion aboard a rig leased from Transocean ( RIG), which killed 11 and resulted in a major environmental disaster, BP said a variety of factors were to blame, and looked to share responsibility with it partners and contractors at the site.

FORBES: Halliburton Sues BP for Defamation, Misrepresentation