Sporting dogs should be kept out of doors in a kennel.猎狗应该养在户外的狗窝中.Once you have chosen a kennel, don't forget to make a booking for your pet.一旦你选好了养狗场，别忘了为你的宠物预订。The bull - dog lay stretched on the straw outside hi...
Acceleration and velocity are both vectors.加速度和速度都是矢量。Mosquitoes are feared as vectors of malaria.恐怕蚊子是疟疾的传播体。Inertia scalars are defined in terms of quantities called inertia vectors.我们将用惯性矢量来定义惯性标量....