in earnest

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

他真的说了他要离开北京。

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

这栋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.

在破裂正式开以来的两年，建筑业的衰退使GDP年增长率每年大约减少一个百分点。