they adopted a trial-and-error procedure.
他们采取了一种反复试验的程序。
But engineering a crop takes a lot of trial and error.
但是对于基因工程庄稼已做了大量的反复试验。
Finally I found out the right way over repeated trials.
经过反复试验，我终于找到了正确的方法。
This lamp was successfully produced after repeated experiments.
经过反复试验，这种灯成功地生产出来了。
endurance testing machine for repeated torsion
反复扭转疲劳试验机
reversed bending fatigue machine
反复弯曲疲劳试验机
cloth repeated stress machine
织物反复应力试验机
Test methods for bare wires--Bend test--Reverse bend test
GB/T4909.5-1985裸电线试验方法弯曲试验反复弯曲
Their experiment finally succeeded after they had tried it repeatedly.
经过反复尝试，他们的实验终于成功了。
Metallic materials--Wire--reverse bend test
GB/T238-1984金属线材反复弯曲试验方法
This lamp was successfully produced after repeated studies and experiments.
这种灯是经过反复研究和试验制成的。
Experimental study on RC columns of L shaped section under cyclic load
钢筋混凝土L形柱反复加载试验研究
Experimental study of composite shear wall slab under cyclic loading
反复荷载作用下复合剪力墙板的试验研究
He was forever experimenting and devising tests to probe the mystery of things.
他反复验证和设计试验去探索事物的奥秘。
Can Static Load Test Reflect True Conditions of Composite Foundation?
静载试验能反映复合地基承载力的真实情况吗?
He tried the experiment again and again. Every time he got the same result.
他反复做了这个试验.每次都得到同样的结果。
Experiment research on treatment of coke plant wastewater with single hybrid biological reactor
复合生物反应器处理焦化废水试验研究
Intermittent Compound Biology Reactor Waste Water Processing Experimental Study;
间歇复合生物反应器废水处理的试验研究