The amateur sailors often take their sailboats out on the lake during weekends.

sailors 是 sailor 的复数形式，sailor 由 sail（航行）加后缀 -or（表示"从事...的人"）构成，字面意思是"从事航行的人"，即"水手、船员"。 amateur sailors 指不以航海为职业的业余航海爱好者。