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

In the quest to understand the fundamental nature of reality, we must be prepared to question even our most cherished assumptions.

Every ton of coal we extract must create maximum value with minimum environmental impact.

The writer's only responsibility is to his art.

If you want to go fast, go alone. If you want to go far, go together.