很少有鸟类会在镜头面前梳理自己的羽毛。Rare birds preen themselves right in front of your camera.燕雀大约在12个星期大小的时候开始换羽毛。Finches start to moult at around twelve weeks of age.拔羽毛必须干净利落。The feather must be removed with a straight, firm pull....
本书主要讨论确定性系统.This book deals with deterministic systems.本书不分析随机现象,主要讨论确定性系统.This book deals with deterministic systems and does not include any analysis of stochastic phenomena.语言学符号与可塑性元素之间的区分; 相似性与确定性之间的暧昧关系,这两组微妙关联构成了古...
They earn their living by squatting the land and sharecropping.他们靠擅自占用土地，按种地的收益分成为生。' seems like some of our neighbors expect to be sharecropping forever, " Dad pointed out.爸爸指出: “ 这就好像我们的一些邻居期望永远和别人收益分成一样....