加速度和速度都是矢量。Acceleration and velocity are both vectors.我们将用惯性矢量来定义惯性标量.Inertia scalars are defined in terms of quantities called inertia vectors.仅由两个矢量组成的力偶叫作简单力偶.A couple consisting of only two vectors is called a simple...
We slammed the gate after them, wedging it shut with planks.他们出去后，我们在后面砰地把大门关上，并用板条抵死。The house was built solidly of rough wooden planks.这房子是用粗木板牢固地建造的.We sawed the log into planks.我们把木头锯成了木板....