1.are due to 由于，因为
例句：These changes are due to an increase in carbon dioxide put into the atmosphere since the beginning of the Industrial Revolution.
这些变化的原因是，从工业革命开始，人类排放到大气中的二氧化碳增加了[[30|%[]a9j]G6。

2.toil away 吃力地走开，长期劳累
例句：ony, a Greek immigrant whose uncle owned the place, ran the diner at night. He gave me endless free refills of coffee as I toiled away.
托尼是一个希腊移民，他的叔叔是这个餐馆的老板，到了晚上托尼负责打理餐馆的生意，在我辛苦备课的过程中，托尼总是为我免费续上咖啡|[2XtFv5+)d-7~yF#ziD。