不缴水费引起的断水的比率正在上升。The rate of disconnections following non-payment of water charges is rising.算出那些比率的平均值再乘以100。Take the average of those ratios and multiply by a hundred.英镑非常坚挺，对德国马克的比率是1比2.88。The pound was rock solid at ...
The human race has enough weapons to annihilate itself.人类有足够的武器灭绝自己。The philosopher speculated about the future of the human race.那位哲学家考虑过人类的前途.Can the human race carry on expanding and growing the same way that it is no...