My progress has been spasmodic and interrupted by trial and error.
我的投资经历了试验和错误.
According to ultrasonic atomization mechanism and trial and error, the fluid dynamic ultrasonic nozzle is developed.
根据超声波雾化机理和经过反复试验, 研制了流体动力式超声波雾化喷嘴.
The fundamental fix — reshaping how care is delivered and how doctors are paid in a wasteful, abnormal system — is likely to be achieved only through trial and error and incremental gains.
基本的解决方式,如改变医保服务的落实方法以及畸形低效的医生支付体系等,都必须要通过反复试验和积累来达成。
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