卡西尼号远离土星环而观察到的每个信号的变化提供了一份环材料分布的侧写。这是一个距土星距离的函数，或是一个光学深度剖面。
The observed changeof each signal as Cassini moved behind the rings provided a profile ofthe distribution of ring material as a function of distance fromSaturn, or an optical depth profile.
主要涉及一些问题，而且我会提供一些关于技术信息的链接，在你进入第二环节前使你对写壳有个更深入的了解。
I'll briefly discuss some pitfalls, and I'll give some links to technical information you will need to be familiar with before going into the next installments.
大学英语写作教学改革中重要的一环就是写前阶段教师的角色转换。
Teachers' role conversion in pre-writing phase is regarded as important in college English writing reform.
大学英语写作教学改革中重要的一环就是写前阶段教师的角色转换。
Teachers' role conversion in pre-writing phase is regarded as important in college English writing reform.
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