空中英慣用短語:
| - n. 空心甜餅, 空心鹹餅, 夾心酥球 profiterole
- 空心電樞 coreless armature
- 空心電樞空心銜鐵 coreless armature
- 空心電離室 hollow ionization chamber
- 空心畫板 hollow drawing board
- 空心矩形尺 open block square
- 空心石英纖維 hollow quartz fiber
- 空心磚墻 brick cavity wall
- 空心硬膠囊 empty hard capsule
- 空心端銑刀 shell end milling cutter
- 空心綫圈 air core coil
- 空心綫圈 Air-core Coil
- 空心絶緣管製造 spaghetti tubing applications
- 空心蠃絲 cored screw
- 空心蠃塞和扳手 hollow-head screw and wrench
- 空心銜鐵 coreless armature
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