in earnest

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

这栋房子修建工作将星期一正式开。

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

他真说了他要离开。

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.

房市泡沫破裂正式开以来两年中，住房建业衰退使GDP年增长率每年大约减少一个百分点。