They were shown animated videos centering around numbers — for instance, one video showed eight frogs on lily pads; four jumped away at once, then two came back one at a time.

有些实验是一些和数字有关的动画，比如，某个视频里，有八只青蛙停在荷叶上，其中四只一下子跳的不见踪影，但两只马上又跳了回来。

youdao

They were shown animated videos centering around numbers — for instance, one video showed eight frogs on lily pads; four jumped away at once, then two came back one at a time.

有些实验是一些和数字有关的动画，比如，某个视频里，有八只青蛙停在荷叶上，其中四只一下子跳的不见踪影，但两只马上又跳了回来。

youdao