variable PI雯参数PIvariableadj.可变的；易变的n.变量；易变的东西variable reheat可调加力variable-lift可变升程variable-lossn.可变损耗variable nebula变光星云variable prices变化的价格variable stroke变程variable profit可变利润variable charge变动费用,非固定费用variable system变量系统variable delays可变时滞

1. This diagram highlights a slice of Saturn's largest ring.
   本图高亮显示了土星的大光环的一个片段。
2. The ring itself is tenuous, made up of a thin array of ice and dust particles.
   新光环是由非常稀疏的冰粒和尘埃粒子组成的。