per interaction是什么意思

用法例句

Development of a New Kind of Prepad;

一种新型压裂预前置液的研制

The purpose of this study is to analyze the attitude of the Hong Kong general public and professional nurses towards advance directives,factors associated with the preference of advance directives,and their attitude towards life-sustaining treatments.

本研究目的是分析香港市民和注册护士对预前指示的态度和使用时所考虑的因素,及他们对垂死病患者采用维持生命治疗的看法。