17.After five minutes of irksome and constrained conversation, they heard the sound of slippered feet approaching rapidly.
经过五分钟阴郁虚伪谈话之后可以听见飞快走来步履声。
18.The sludge application constrained under the rate of 4.8kg/m2 for woodland and 2.4kg/m2 for lawn, has good bio-effects for the growth of metasequoia and lawny-grass.