The laugh at that time are triggered by surprise in a safe situation (think peek-a-boo), and don't just endear babies to their parents.

那时候的笑在一个安全的条件下，被一个个意外的情况引起（比如躲猫猫），不要让小宝贝们只跟他们的父母亲密。

We'll admit, peek-a-boo is best-loved by babies who can't really insist on playing any games.

我们要承认，躲猫猫是婴儿们的最爱，因为婴儿们还不能真的坚持玩任何游戏。

NASA's Hubble Space Telescope caught Jupiter's moon, Ganymede, seemingly playing a game of peek-a-boo in this image in April 2007.

2007年4月，NASA 的哈勃空间望远镜捕捉到木星的月亮——Ganymede——的踪迹，看起来像是正在玩躲猫猫的游戏。

My kids decided a few months ago that peek-a-boo was their favorite game.

就在几个月前，我的孩子们决定，躲猫猫是他们最喜爱的游戏。

Peek-a-boo (lower back): Lie face down on the floor using your outstretched arms to support baby in front of you.

躲猫猫（锻炼后腰）：脸朝下，用你伸展的胳膊支撑住你前面的婴儿。