- triangular system
- 三角形: triangle; triangular shape
- 方程组: combined equations; coupled equations; equation group; equation set up; equations set; gleichungssystem system of equations; set of equations; simultaneous equations; system of equations
- 变形方程: deformation equation
- 非线形方程: nonlinear equation
- 八角形方钻杆: octagon kelly
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