单元：Unit 04.txt

• disaster
• tornado
• drought
• landslide
• slide
• tsunami
• flood
• volcanic eruption
• magnitude
• rescue
• damage
• destroy
• evacuate
• helicopter
• death
• affect
• shelter
• crack
• as if
• ruin
• in ruins
• percent
• brick
• metal
• shock
• in shock
• electricity
• trap
• bury
• breathe
• revive
• revival
• effort
• unify
• wisdom
• context
• suffer
• volcano
• erupt
• supply
• typhoon
• in the open air
• hurricane
• survive
• power
• tap
• pipe
• whistle
• emergency
• calm
• aid
• kit
• first aid kit
• on hand
• crash
• sweep
• sweep away
• wave
• strike
• deliver
• summary
• effect
• length