The concept of the representative elementarylength (REL) and its coordination meaning are presented for the first time.
本文首次提出代表单元尺度(REL)概念及其协同学意义。
2
The elementary unit of length is the "meter", it's common knowledge.
长度的基本单位是“米”，这是常识。
3
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.