慢速英语:Cities Aim to Make Once-Polluted Rivers Safe for Swimming

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splash – v. to cause water or another liquid to move in a noisy or messy way

dock – n. a structure built out into the water and used as a place to get on or off or tie up a boat.

hazardous – adj. involving risk or danger

toxic – adj. containing poisonous substances

sludge – n. thick, soft, wet mud

glow – v. to shine with low light and heat but usually without flame

canal – n. a long narrow place that is filled with water and was created by people so that boats could pass through it or to supply fields, crops, etc., with water

lifeguard – n. a person whose job is to protect swimmers from drowning

inner tube – n. a round tube that holds air inside a tire