- self-erection rig
- 自立: stand on one's own feet; sup ...
- 的: 4次方是 The fourth power of 2 i ...
- 钻机: rig; drilling machine
- 自立的: freestanding; self supporting; self-erecting; self-sufficient; self-sufficing; self-supporting; self-sustaining
- 不能自立的: unable to act without help needing the helof others
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