This is really a difficult time for you because your whole life has been vision, excitement, recruiting, positive growth, and suddenly you are faced with contraction.
这段时间对你来说很困难，因为你整个人生就是设想，激情，招聘，积极成长，而突然你就面临着收缩。
2
After a contraction of some 3% in 2009, a lacklustre recovery means that growth for the region as a whole is unlikely to be much more than 3% in 2010.
Using contraction theory dealing with track convergence, cope with controller and observer as a whole, bring forward a sufficient condition to design nonlinear system.