By high acetylation of chitosan at N position with acetic anhydride in a homogeneous medium known as acetic solution–alcohol-pyridine system, water-soluble chitosan was prepared.

探讨了如何控制在均相条件下以高脱乙酰度的壳聚糖为主要原料，在乙酸水溶液- 乙醇- 吡啶介质中实现壳聚糖N位乙酰化反应的问题；

youdao

Recall that returning a single character at an arbitrary position within a rope is an o (log n) operation.

返回rope内任意位置字符的操作是个o (log n)操作。

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If you do not specify a position with the -n parameter, the new rule is added at the end of the table.

如果未使用—n参数来指定位置，那么新的规则将会被添加到表格末尾。

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He said lawmakers needed to voice a position before Wednesday's U.N.General Assembly consideration of a resolution supported by Arab countries on the Goldstone report.

VOA: standard.2009.11.04

So when we talk about a wave function squared, n l m he wave function, any one that we specify between n, l and m, at any position that we specify based on r, theta, and phi.

一个波函数,的平方时，对特定,特定位置r，theta，phi波函数，取平方,如果我们取平方。

麻省理工公开课 - 化学原理课程节选

Iran's President Mohammad Khatami has contacted the leaders of Egypt, Saudi Arabia and Syria to drum up support for his position that the U.N. should lead any worldwide fight against terrorism.

CNN: Europe lobbies Mideast leaders

United Nations Secretary-General Ban Ki-moon expressed "grave concern" over the reports of Israeli airstrikes in Syria Sunday but stressed that the U.N. is not "in a position to independently verify what has occurred, " his spokesman said.

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French President Francois Hollande reiterated his position calling for the U.N.

CNN: Syrian forces hammer Aleppo as the opposition urges action