That tells you something about the physical chemistry of the molecule; that it's these hydrogen bonds that hold the double strands and I can break those down under certain conditions.

我们从中可以知道一些,DNA分子的理化特点,双链是由氢键连接在一起,在一定条件下这些氢键可以断裂

耶鲁公开课 - 生物医学工程探索课程节选

The referees were busy for much of the day, with the Clippers called for 26 fouls to the Thunder's 22 in a physical game that featured double technicals on Caron Butler and Kendrick Perkins for their verbal exchange and Ibaka's flagrant-1 foul on Griffin.

NPR: Thunder Holds Off Clippers To Win 108-104

Israel has stepped up its military deployments near the border and is constructing a 240km (150-mile) double fence to act as a physical barrier.

BBC: Sinai attack marks step change in border violence

Sparkling in his role as a conscience-struck double agent, he fights intrigue and physical danger to triumph in the end.

ECONOMIST: Sierra Leone