垂直线条能让矮个美眉看起来更苗条更高些，水平线条的作用正好相反。
Vertical lines make short women look thinner and taller; horizontal lines do the opposite.
紧张或张力和对比也是绘画中的原则。我知道线条，形态，色调，色彩的对比产生活力。紧张或张力有什么作用呢？
Tension and contrast are also principles in painting. I know contrast in line shape to ne and colour creates vitality but how about tension.
它控制运动以确保光合作用的最佳光线条件。
It controls locomotion, ensuring optimum light conditions for photosynthesis.
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