求翻译：马克吐温生于美国密苏里州，他是美国19世纪最著名的作家之一，他的家乡位于密西西比河畔。在他成年之后，他曾经在密西西比河上当过水手。马克吐温是他的笔名，这个笔名的由来是水文测量表上“两个刻度”的标记。是什么意思？

Mark Twain was born in Missouri, USA, he is one of the most famous writers of the 19th century, his hometown in the Mississippi River. In his adulthood, he had taken in over the Mississippi River sailor. Mark Twain is his pen name, the origin of this pseudonym is two notches to "mark on the hydrogra

Mark Twain was born in Missouri, United States, he is an American 19th-century's most famous writers of his home, located in Mississippi River. When he came of age, he had been tricked into the Mississippi River have been a sailor. Mark Twain is his pseudonym, and the pseudonym of the origin is a hy

Mark Twain had been born in the American Missouri state, he is American one of 19th century most famous writers, his hometown is located the Mississippi river bank.After him grown-up, he had been swindled in the Mississippi river the sailor.Mark Twain is his pen name, this pen name origin is the hyd

Mark Wen Sheng in United States, Missouri, he was the United States one of the 19th century's most famous writer, his home located in the banks of the Mississippi River. In his adult life, he has taken in the Mississippi River was a sailor. Mark Twain is his pen name, the origin of the name is a hyd

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