Inquiry into reality begins with the recognition of our ignorance.
树木有根则繁茂,根腐则树枯萎;鱼有水才能活,水干涸了鱼则必死;灯有油才光亮,油尽则灯灭。人有真精神,保护则长寿,戕害则必死。
The relationship between wages and employment is not as straightforward as some models suggest.
The past is always tense, the future perfect.