英语听力精选进阶版 14200（在线收听）

Texas blast investigation

Vocabulary

search and rescue operation

procedure to find and save people from a disaster

winding down

slowly stopping

ensuring

making sure

hazardous chemicals

dangerous materials

threat

possible or likely danger

to establish

to find and prove

dozens

groups of 12 (used here to mean lots)

bore the brunt

felt the most force

blast

explosion

restricted

limited