用贝壳来装点盒子、托盘、镜子甚至是花盆。Use shells to decorate boxes, trays, mirrors or even pots.她最喜爱的题材是那些在海边散步时发现的贝壳。Her favourite subjects are shells spotted on beach walks.我们在海滩拾贝壳。We collected shells on the beach....
电流滞后于电压.The current lags behind the voltage.如果输入的电压是+3伏, 那么输出的电压便是-6伏.If the input voltage is plus three , it comes out as minus six.我们用以表示电压和电流的单位分别为伏特和安培。The units in which we show voltage and current are volt and ampe...