arcuation
成弧作用
ar·cu·a·tion /ˌɑrkjəˈweʃən/ 名詞
Arc·u·a·tion n.
1. The act of bending or curving; incurvation; the state of being bent; crookedness.
2. Hort. A mode of propagating trees by bending branches to the ground, and covering the small shoots with earth; layering.
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