- switching within strings
- 倒换: rotate; take turns
- 钻具: drilling tool; drilling rig
- 倒换: 1.(轮流替换) rotate; take turns 倒换着看护伤员 take turns looking after the wounded2.(掉换) rearrange (sequence, order, etc.); replace; 倒换段 switching section
- 换钻头: bit change cambio de barrena; bit changing
- 更换钻头: bit change
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