The outer cylinder (1) made by glass is nested out the inner cylinder (2) made by glass.
把用玻璃制成的外筒(1)套放置在用玻璃制成的内筒(2)的外面。
The end effector includes an outer cylinder having at least one opening in its cylindrical wall.
所述端部执行器包括外圆筒，所述外圆筒在其圆柱形壁中具有至少一个开口。
Gaps (4) are left between the outer cylinder and the inner cylinder, and air in gaps is pumped into vacuum (3).
并使外筒与内筒之间有间隙(4)，把间隙内的空气抽少成真空(3)。
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