in earnest

1.He was in earnest when he said he was leaving Beijing.

真的要离开北京。

2.The work on the house will begin in earnest on Monday.

这栋房子的修建工作将在星期一正式开。

3.In the two years since the housing bust started in earnest, the contraction in homebuilding has taken around one percentage point a year of GDP growth.

在房市泡沫破裂正式开以来的两年中，住房建筑业的衰退使GDP年增长率每年大约减少一个百分点。