农民们正在田地里辛勤劳作。

The farmers are ___laboring hard in the fields.

医生告诉她，分娩过程通常持续6到12个小时。

The doctor told her that ___labor usually lasts between 6 to 12 hours.

工会代表劳工与公司谈判更好的工作条件。

The union negotiates better working conditions for ___labor.

工人们辛苦劳动了一整天来建造这座桥。

The workers ___labored all day to build the bridge.