A plunger is always longer than its stroke and only one end is available for pumping. Double-acting plunger pumps require at least two cylinders and plungers.
柱塞的长度总大于它的冲程，并只有柱塞的一个端面为液体增压。双作用柱塞泵至少需要两个缸体和柱塞。
End pumping is a simple pumping method in double clad fiber laser.
端面抽运是双包层光纤激光器的一种常见的抽运方式。
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