句子序号123412345612345612
论文题目作者ned with microbubblesBO ZHANG国籍中国语步（Move-step)2.1a1.1b1.1b2.1d1.1a1.1c1.1c1.1b1.1b2.1a1.32.22.1c2.1c2.1c2.1a3.1a3.5
信号词CurrentlyHoweverTherefore句子类型句子连接词句子长度时态T2T1T1T1T1T1T2T2T2T2T2T2T2T2T1T2T4T1
语态HoweverIn recent years27therefore28
40
It has been proven that20It is hypothesized that35
51However, to date
The present study aimed to examin26To the best of our knowledge27
V1V1v2v1v1v1V1V1V2V2V2V2V1V1
情态助动词
may
may
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