The effect of environment factors on the ageing of polymer materials, the ways of artificial aging test and the ways of protection against ageing are introduced.

本文分析了各种环境因素对高分子材料的影响，介绍了常用的几种加速老化试验的方法及老化材料防护措施。

youdao

Guideline 2, protection of global data, can be ensured in two ways.

准则2，全局数据的保护可以通过两种方式得到保证。

youdao

An ever-escalating array of industry-developed vaccines confer short-term protection, but at the expense of provoking flu to evolve in unpredictable ways.

一系列产业研制的不断升级换代的疫苗具有短期保护作用，但其代价是引惹流感以不可预测的方式演变。

youdao

This seems in many ways to be quite far from the American democracy based on constitutional government, systems of checks and balances, protection of individual rights, and so on.

这似乎在很多方面,有别于美式民主,后者的根基是宪制政府，制衡体系，保障个人权利等。

耶鲁公开课 - 政治哲学导论课程节选

So, apart from all the side events with millionaire financiers launching ideas for getting money to poor countries, and ocean scientists warning that the oceans are turning more acidic because of CO2, and forestry experts explaining all the different and often conflicting ways of funding the protection of the forests, you have the main negotiations themselves.

BBC: Harrabin's Notes: Inside Copenhagen

They also dealt with other matters of common concern related to various ways of heritage protection and preservation.

UNESCO: MEDIA SERVICES

The lecture presents recent cases and discusses ways to improve and extend the protection of cultural heritage.

UNESCO: Lecture: Heritage and Conflict