台球是一种有益的户内游戏。

Billiards is a good indoor game.

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户外太湿，孩子只好在户内游戏玩耍。

It was too wet to go outside, so the children had to be contented with playing indoors.

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而从最早的电子游戏中借鉴而来的等级体制，就是一个绝佳的方式用以对用户形成一种持续的激励，并提供一个让用户内省的机会。

Levels, a game mechanic from the earliest of video games, are the perfect solution for creating a constant sense of forward motion and the opportunity for reflection.

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