试运行的英文：
preoperation
trial operation
pilot run
test run
trial operation
pre-commissioning
The factory has worked successfully since its trial run last year.
工厂自从去年试运行以来，生产很顺利。
试运行; 空转
trial是什么意思：
n. 审讯；试验，试用；磨难；努力；选拔赛
adj. 试验的，试用的；审讯的
Trial by ordeal.
神裁法。
The trial attracted wide attention.
此案审理引起了广泛关注。
The boy is a trial to his parents.
这男孩是他父母的包袱。
n. 飞行员，宇航员，引航员；舵手，试播节目，指导员，自动驾驶仪
v. 驾驶，带领，试验，试点
adj. 试验性的，导向，辅助性的
What are the qualifications for an airline pilot?
当一名民航飞机驾驶员要具备哪些条件?
He cut in the automatic pilot.
他接通自动导向器。
hand reamer with pilot
带导向柱的手铰刀