等下，咋咱俩角色交换了？
Each person should switch roles frequently.
每个人都应该经常切换角色。
If the driver gets stuck or frustrated or loses his train of thought, the navigator and driver can switch roles.
如果驾驶员停滞不前或受到挫折或者失去了思路，导航员和驾驶员可以互换角色。
The two reporters agreed to switch roles for once and be the interviewees rather than interviewers in order to let us know about their work and how the news we read is made.
为了让我们了解他们的工作以及我们读到的新闻是如何制作与写作的，两位记者同意转换一次角色，充当被采访者而不是采访者。
Bone marrow stem cells can switch roles to produce a protein that promotes growth of the cornea, the transparent layer of the eyeball, scientists have found.
科学家已经发现骨髓干细胞能够转化角色，产生一种蛋白。该蛋白能促进眼角膜(眼球透明层)的生长。
The two reporters agreed to switch roles for once and be the interviewees rather than the interviewers in order to let us know about their work and how the news we read is made and written.
这两位记者同意转换角色，做一次被采访者而不是采访者，让我们了解他们的工作，了解我们读到的新闻是怎样制作和编辑出来的。
The two reporters agreed to switch roles for once and be the interviewees rather than the interviewers in order to let us know about their work and how the news we read is made and written.
这两位记者同意转换角色，做一次被采访者而不是采访者，让我们了解他们的工作，了解我们读到的新闻是怎样制作和编辑出来的。
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