包括白色背景在内的六种颜色代表了世界上所有国旗的颜色......这是一个真正的国际标志。

Some birds are not meant to be caged, their feathers are just too bright.

I know that the appearance of Los Angeles at four o 'clock in the morning every day.

反应倾向的强度取决于所接受的强化量。

Sustainable fishing isn't an option—it's the only way forward if we want to preserve marine life.

历史既没有愿望也没有能力使人变得更好或更坏；它仅仅记录了他们曾经是什么以及他们做了什么。

The world is full of broken people.

物理学中的每一个发现都打开了一扇通往新奥秘的门。