Carl Sagan was a member of the scientific team that sent the Voyager One and Voyager Two space vehicles out of our solar system.
卡尔.萨根还是航行者一号和航行者二号的科研小组成员，航行者一号和二号是两艘飞往我们太阳系以外星系的探测器。
To test how the system works, the team tried making two different kinds of pores - some that were uniformly sized tubes, others that had a narrow bottleneck at one point and then widened out.
测试这个系统的性能，该小组坐了两个不同的孔，一个是上下大小相同的管子，另一个是上小下大的。
On the first level, two types of feasible structures are considered by one single enterprise. Influences of coefficients on choice of system are figured out by analysis of costs;
第一个层次讨论了单个企业自行回收的两种系统结构，通过成本模型分析参数对构建回收系统的影响；
On the first level, two types of feasible structures are considered by one single enterprise. Influences of coefficients on choice of system are figured out by analysis of costs;
第一个层次讨论了单个企业自行回收的两种系统结构，通过成本模型分析参数对构建回收系统的影响；
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