一句话，先是太胆小，明知错的事却不敢不做；后来也还是太胆小，明知对的事却不敢去做。
俄罗斯的面貌反映在它的人民的眼中。
The man who does not value himself, cannot value anything or anyone.
Science is the knowledge of consequences, and dependence of one fact upon another.
Earth provides enough to satisfy every man's needs， but not every man's greed.
"Sex is like money; only too much is enough."