This study adopts the researching methods of class observation and questionnaires to obtain data concerned systematically.

研究中采用了课堂观察和开放式问卷调查的研究方法系统地获得研究的数据信息。

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Through class observation and survey, it's common that in nowadays math classes, cooperative study mode is excessively used.

通过课堂观察和调查发现，合作学习被泛用的现象并不少见。

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Instruments used in this thesis are questionnaire, interview and class observation, which can make the study creditable and valid.

为使本研究具有可信度和有效性，本文主要使用了调查问卷、采访、课堂观察等调查工具。

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Today, first-class observation cars with panoramic windows let leaf-peeping tourists zoom through the hill country in one day.

BBC: Getting to the heart and soul of hilly Sri Lanka