Every single item in this envelope has passed from our hands to hers.

信封中的每一样东西都是我们亲手给她的。

The way our blood circulates, this is exactly what would happen to our own hands in the same position.

当我们双手处于相同位置的情况下，我们的血液循环就是这样的。

Whale flippers are more similar to our hands than they are to the fins of fish.

与鱼鳍相比，鲸鱼鳍更像是我们的手。

If all these conversation-like games, gestures, and tongue protrusions really do relate to the same brain area, it could help support that language evolved from our hands to our mouths.

如果所有这些类似对话的游戏、手势和吐舌头确实与同一个大脑区域相关，那么它可能有助于支持语言从我们的手演化到我们的嘴巴。