- built-in sections
- 由: cause; reason
- 部件: component; unit; parts; asse ...
- 装配: assemble; fit together; fit ...
- 的: 4次方是 The fourth power of 2 i ...
- 部件装配: component assembly; componentassembly; major assembly; pre-assembling=preassembling; sub-assembling; subassembly
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