Definition
To suddenly lose the energy, enthusiasm, or ability to continue an activity or process.
失去動力，沒了熱情
After months of hard work, the project seems to have run out of steam.
經過數月的努力，這個專案似乎已經失去了動力。
He was excited to start the new job, but he quickly ran out of steam.
他對新工作充滿熱情，但很快就失去了動力。
The reform plan progressed well initially, but now it seems to have run out of steam.
改革計劃一開始進展順利，但現在似乎已經失去了動力。