The reference trajectory is a classic second order curve. The controller parameters have clear physical meaning and are easy to tune.
其参考轨迹是一条典型的二阶曲线,控制器参数具有明显的物理意义,且易于整定。For one of the two DNA strands, a problem exists in that the very end of the strand cannot be copied.
对于双链DNA分子中的一条,出现了一个问题,那就是此链的末端无法被复制。He said to use the lifeline running along the ceiling, a slender rope threaded through wooden cones, like floats in a swimming pool.
他告诉大家要使用天花板上垂下的救生索,那是一条穿有木质球果的绳子,类似游泳池内的浮标。THERE is nothing like high oil prices, it would seem, to free a European airline from protective national sentiment.
似乎没有什么能像居高不下的油价一样,能将一条欧洲航线从一种保护性的民族主义情绪解放出来。On Thursday, the singer was photographed out in the city covering her baby bump with a black blazer and a flowing scarf.
上周四,这位歌手还在街上被拍到,当时她用一件黑色的外套以及一条宽大的围巾掩盖着自己的大肚子。Almost pulled down in the 1960s to make way for a second ring road around the modern day city, a large portion in fact escaped destruction.
大约在20世纪60年代,为了在现代化的新城外围再铺一条环形公路,老城墙被推倒了,事实上大部分还是躲过了浩劫。Turning off the highroad up a green lane, an hour later, he beheld a youngster prying into a hedge head and arms.
他走下公路,转入一条绿草如茵的小路。一个钟头后,他见到一个孩子,头和手臂都扎进一丛树篱中。It is as if I am governed by an internal time-wasting law that says the amount of time wasted in any day is constant.
就好象我受到一条内在的浪费时间定律的控制,即我每天浪费的时间总量是恒定的。That, at any rate, was one of the lines being spun by the Obama administration this week.
无论如何,这是本周奥巴马政府所织的一条线。