up down counter 可逆计数器
up-down-counter 加减计数器
up-and-down counter 增减计数器
UDC Up C Down Counter 加减计数器
down up counter 可逆计数器
A clock or a strobe signal is used to synchronise operation of the comparator, the up-down counter 102 and the digital to analog converter 100 so as to avoid these components racing.
时钟或者选通信号用于比较器、递增-递减计数器102和数模转换器100的同步操作，以便避免这些部件竞争。
She walks up to the counter, SLAMS a book down and screams at the librarian, - "This is the WORST book I've ever read!"
她走向柜台，砰的一下把书摔到上面然后冲着馆长嚷到，-“这是读过的最烂的书了！”
She sank down on one of the little stools behind the counter of the booth and looked up and down the long hall which, until this afternoon, had been a bare and ugly drill room.
她坐在摊位柜台后面的一条小凳子上，前前后后地观看那个长长的展览厅，这地方直到今天下午以前还是个空空荡荡难看的教练厅呢。
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