The length of the war is one of the biggest unknowns.战争要持续多久是最大的未知数之一。There are many unknowns in science.科学上还有许多未知之处.It was like a single equation with two unknowns.这挺像两个未知数组成了个简单方程....
这是一台机械推动的车辆.This is a mechanically propelled vehicle.这机器是由电推动的.This machine goes by electricity.一种以火箭推动的装置将其在大气中飞行时热度增加的资料以远距离记录仪传送回来.A rocketpowered device telemeters heating data obtained on flights through the atmosph...
她那蜡黄的皮肤紧紧地包着脸上的骨头。Her sallow skin was drawn tightly across the bones of her face.你能听到锯子锯进骨头里的声音。You can hear the saw as it cuts through the bones.跟肉铺老板要煲汤用的骨头（最好是髓骨）。Ask the butcher for soup bones (marrow bones are best)...