色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

Science is not about finding absolute truths, but about constantly pushing the boundaries of our understanding.

有兩樣東西，人們越是經常持久地對之凝神思索，它們就越是使內心充滿常新而日增的驚奇和敬畏：我頭上的星空和我心中的道德律。

We don't inherit the earth from our ancestors; we borrow it from our children. This principle guides every step we take.

我們都在陰溝里，但仍有人仰望星空。

成功是一種心態。如果你想成功，就要開始把自己看作一個成功者。