Definition: needing or using a lot of physical or mental effort Level: B1
他用力推了门。
He gave the door a ___hard push.
农活涉及很多辛苦的工作。
Farming involves a lot of ___hard work.
经过几个月的刻苦学习，她通过了考试。
After months of ___hard study, she passed the exam.
