It is doubtful whether true linearism exists in any social process or evolution. 在作何社会演变过程或进化中是否存在着真正的直线连续性是个疑问。
It is not too difficult to imagine that on some other planets orbiting around other stars the same process has gone on. 不难设想,在环绕着其他恒星运行的一些行星上,也进行着同样的演变过程。