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

緩慢的程度與記憶的強度成正比；速度的程度與遺忘的強度成正比。

Sustainability isn't an option; it's a necessity for the future of energy.

The profession of book writing makes horse racing seem like a solid, stable business.

領(lǐng)導(dǎo)力意味著今天做出艱難的決定，為未來的幾代人帶來利益。