傥来之物[tǎng lái zhī wù]
an unexpected [undeserved] gain; a thing which comes to hand unexpectedly; sth. which comes by accident
1. \u0039\u0031\u0031\u67E5\u8BE2\u00B7\u82F1\u8BED\u5355\u8BCD
1. 这是所谓傥来之物,容易来,容易去。
This is what I call easy money, but easy come easy go.