These lasers usually employ chemical combustion to energize directly the lasing process by various one - way reactions.这些激光器一般利用化学燃料,通过各种 单向 反应直接驱动激射过程.Random lasing is intensively investigated for its wide prospective.随...
当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.他们零星散居在安第斯山脉的高处。They live high ...
We delved through a sackful of letters to draw the winning name.我们把手探进一袋信件中抽取获奖者。She delved in her handbag for a pen.她在手提包里翻找钢笔。He delved into the family archives looking for the facts.他深入查考这个家族的家谱以寻找事实根据....