Samuel Clemens began his writing career as a reporter.

尔 克莱门斯以当记者开始他的写作生涯。

Mark Twain and Samuel Clemens were one and the same person.

马克·吐温和塞缪尔·克莱门斯是同一个人。

Mark Twain and Samuel Clemens were one and the same person.

马克·吐暖和赛缪尔·克莱门斯是一个人。

Samuel Clemens, usually known as Mark Twain, became a famous American writer.

塞缪尔·克莱门斯，通常被称作马克·吐温，成了著名的美国作家。

Samuel Clemens, (who was) known as Mark Twain, became a famous American writer.

塞缪尔·克莱门斯以笔名马克·吐温而成为美国著名作家。