Some analysts have suggested that the Obama administration move to dramatically change the nature of the U.S.-Iran relationship through a so-called "grand bargain" by,for example,making some concessions on regional security issues in return for an end to Iran's nuclear program and its interference in Iraq and Afghanistan.

VOA: standard.2009.05.05

For these purposes think about a channel, it only allows sodium to go through for example.

基于此目的,我们来讲离子通道,拿仅允许钠离子通过的通道作为例子

耶鲁公开课 - 生物医学工程探索课程节选

For these purposes think about a channel, it only allows sodium to go through for example.

基于此目的,我们来讲离子通道,拿仅允许钠离子通过的通道作为例子

耶鲁公开课 - 生物医学工程探索课程节选