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。

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.

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执行清灰任务的是清灰装置，清除下来的灰尘要从箱体中排走，所以在箱体下面设有上大下小的灰斗，将灰尘集中起来排出。

Execution of the mission is clear out dust ash, dust removal equipment down from the cabinet, so the drained away in a big on the small ash hopper, the dirt concentration up eduction.

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荔枝的形状是椭圆形的，上大下小，像一个小灯笼，又像一个马蜂窝。

Lychee is an oval shape and large small, like a small lantern, like a hornet's nest.

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