Submitted by admin on Sat, 05/17/2014 - 19:50
definition:
The draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.
sentence:
Over time, fertilizer run-off from agriculture, for example, may load the lake with excess nutrients.
difficulty:
medium
toefl frequency:
2
toefl classification: