He topped off his career with an Olympic gold medal.他以一块奥运金牌为自己的职业生涯画上了圆满的句号。High stone walls topped with snaky concertina wire, set off at intervals by looming guard towers.顶部装着蛇腹式铁丝网的高高的石墙, 被渐渐隐现的哨塔隔开.There were more e...
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...