trial run        
v. 试运。试。试转。
trial run

---

[das] 演赛。试运转。模拟赛。
trial run, experiment

---

[der] 试验运转，试验程。试。
test run, trial run

---

[der]试运。试。试转。
trial run

---

[die]试。试运。
test drive, trial run