| 单词 | packing expander |
| 释义 | > as lemmaspacking expander ΚΠ 1865 Sci. Amer. 9 Dec. 379/1 Forging apparatus... Annular packing expanders applied to one or both ends of the cylinder. a1884 E. H. Knight Pract. Dict. Mech. Suppl. 652/1 Packing expander, a spring to spread the packing of a piston or valve against the surface upon which it traverses. < as lemmas |
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