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

The true measure of agricultural success is sustainability across generations.

每個實驗都是向自然提出的一個問題，每個結果都是自然的回答。

A book is a dream that you hold in your hand.

I think goals should never be easy, they should force you to work, even if they are uncomfortable at the time.

無限小在自然中的作用是無限大的。

The most dangerous poison is the feeling of achievement. The antidote is to think every morning, 'What can be done better?'