- helpful system
- n.一套有效的管理系统
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
helpful system
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Cartesian coordinate system — Illustration of a Cartesian coordinate plane. Four points are marked and labeled with their coordinates: (2, 3) in green, (−3, 1) in red, (−1.5, −2.5) in blue, and the origin (0, 0) in purple. A Cartesian coordinate system specifies each point… … Wikipedia
