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

物理學的美麗在于它能夠用簡單解釋復雜。

The future of seafood lies in our ability to balance demand with ecological responsibility.

The study of nature is a perpetual joy.

The development of an enterprise does not rely on one person but on a team.

The man in the planning room, whose specialty under scientific management is planning ahead, invariably finds that the work can be done better and more economically by a subdivision of the labor.

I think music is the greatest art form that exists, and I think people listen to music for different reasons, and it serves different purposes.