math_lang 漂亮的打印计算器语言 有点像智能乳胶 需要一个更好的名字 例子 mass = 10 kg F_0 = 1000 N = ? dt_{force} = 0.5 s y_{vel} = F_0 / mass * dt_{force} = ? g = 9.81 m/s^2 dt_{air} = 10 s h = y_{vel} * dt_{air} - ((1/2) * g * dt_{air}^2) = ? 输出: ln2 = 0.693 k = ln2 / (4.47 * 10^9 * 1 year) = ? e = 2.71828 hl = 4.47 year * 10