Punctuation marks between two parallel sentences

两个句子间的标点符号

Two related sentences can be separated by a “;”

The nanotube research grows rapidly in recent years; it is the most active filed in nanoscience. √

or joined by “and”

The nanotube research grows rapidly in recent years and it is the most active filed in nanoscience. √

or separated by “,” followed by “and”

The nanotube research grows rapidly in recent years, and it is the most active filed in nanoscience. √

The nanotube research grows rapidly in recent years, it is the most active filed in nanoscience. x

“,” cannot mark two independent sentences

The nanotube research grows rapidly in recent years, and is the most active filed in nanoscience. x

“and’ can only be used to join two independent sentences

这个错误经常出现， 应特别留意。

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