By about 6 weeks of age, most babies begin to show something approximating a day/night sleeping pattern.到6個星期大時，大多數(shù)嬰兒開始表現(xiàn)出近似于日夜分明的睡覺模式。Something approximating to a fair outcome will be ensured.保證會有大致公正的結果。In the finite e...
The source is made of semiconductor laser, collimating and coupling system, narrow pulse driving circuit.光源包括半導體激光器 、 準直耦合元件和窄脈沖發(fā)射驅(qū)動電路.Using video - cam directly collimating on computer screen, it is convenient to operat...