1·There are three components to this system: a large electrical power source, metal coils lining a guide way or track, and large guidance magnets attached to the underside of the train.
这种系统有三个组成部份：一个大电源、一条导向线路或轨道沿线的金属线圈、以及附加在列车下面的大导向电磁铁。
2·Its underside was transparent, because its insides could be seen.
它下面是透明的，能看见里面的内脏。
3·Its mouth is at the very front of its head unlike other sharks, which have their have their mouths on the underside of the head.
与其他嘴长在头部下面的鲨鱼不同，它的大嘴长在头的正前部。
4·If you use carpet on a wood floor, make sure it won't move (i. e., has a rubber underside) if someone walks across it.
如果你在木地板上铺地毯并且有人会在毯子上走动，那你要确定地毯不会滑动(也就是说，要有些橡胶在下面)。
5·The stove can simultaneously bake the upside and the underside of a pancake in the pan so that the pancake is tender with a crispy crust and has delicious taste.
该炉具可同时对锅中吊炉饼的上面和下面进行烘烤，使吊炉饼外焦里嫩，味道鲜美。