after much thought and study 之后许多思考和研究 ; 在许多思考和研究 ; 经过大量的思考和研究
ci-study thought 词学思想
happy study thought 乐学思想
study of thought 思想研究
study-weary thought 厌学思想
study thought and method 研究的思路和方法
the thought of document study 文献学思想
study on the thought 思想研究
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