我们必须避免出现20世纪80年代那样具有破坏性的繁荣萧条交替循环的局面。We must avoid the damaging boom-bust cycles which characterised the 1980s.这是完善循环的最低限度人数.That is the minimum number necessary to complete the circuit.人类对硫循环的影响一直是很可观的.Man's effect ...
A little porcupine made a house by the side of the river.小刺猬在小河边上造了一幢小房子.It is the Kookaburra ( Porcupine ) and Skunk Kingdoms that greet you today.今天是笑翠鸟 ( 豪猪 ) 和臭鼬王国向你们问候.One of the sharp hollow spines of a porcupine o...