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

數學不是一門演繹科學——那是陳詞濫調。當你試圖證明一個定理時，你不僅僅是列出假設然后開始推理。你所做的是反復試驗、實驗和猜測。

"History is the echo of voices we can no longer hear."

A library is a cemetery of living books, each one waiting to be resurrected by a reader.

沉默如此深沉，以至于它在咆哮。

True leadership in forestry means thinking beyond quarterly reports.

The greatest prison people live in is the fear of what other people think.

心理學應關注心靈如何運作以解決實際問題，而不僅僅是其抽象結構。