下图为某同学“探究牛顿第一定律”的实验装置．实验中该同学先后三次将同一木块放在同一斜面上的同一高度，然后分别用不同的力推了一下木块，使其沿斜面向下运动，逐渐减小水平面的粗糙程度，观察木块运动的距离，从而得出力和运动的关系.

Li Ming is staying with the Wang's family for the weekend.
Today it is warm and fine. The family are having dinner in the garden. They often have dinner in the garden on a warm and fine spring day. Now Mr. and Mrs. Wang are sitting at the table with Li Ming under a tree.
"It's great to have dinner out here on such a lovely day," Mrs. Wang says. "What's the weather like in your hometown, Li Ming?"Mr. Wang asks. "It's not very warm in spring. But I like the spring there best." "Help yourself to some cakes, Li Ming," Mrs. Wang says. "Thanks," says Li Ming. "The cakes are very nice. I enjoy the dinner very much."

关于动物细胞培养的叙述错误的是