Samuel Clemens, who was known as Mark twain, became a famous American writer.
塞缪斯·克莱门斯，以马克·吐温知名，成了美国名作家。
Mark twain was once a river pilot on the Mississippi.
马克。吐温曾当过密西西比河上的领航员。
Mark twain and Samuel Clemens were one and the same person.
马克·吐温和赛缪尔·克莱门斯是一个人。
