time arrow

例句：

1. 1.The time arrow is pointing towards the future.
   时间箭头指向未来。
2. 2. Time is a valuable commodity that we cannot afford to waste.
   时间是一种宝贵的资源，我们无法浪费。
3. 3.Time flies when you're having fun.
   当你玩得开心时，时间飞逝。