而试验完成的日期被反复地推迟。
And the completion date for the trial has been repeatedly postponed.
经过反复试验，这种灯成功地生产出来了。
This lamp was successfully produced after repeated experiments.
经过反复的工艺试验及一年多批量生产验证，成功地将熔融石英应用于精铸用低温蜡—硅溶胶型壳生产中。
By repeating technological tests and batch production tests for over a year, the fused silica was successfully used in the production of silica sol shell for low temperature wax precision casting.
他还说，“并不像我们想得那么简单，我们经历了很多轮的反复试验，才艰难地控制住了一根线条，手工画出了这样的杰作。
Mr Hwee Chong added: "It wasn't as easy as we thought. We went through many rounds of trial and error, painstaking drawing the masterpieces in one controlled line, by hand."
他还说，“并不像我们想得那么简单，我们经历了很多轮的反复试验，才艰难地控制住了一根线条，手工画出了这样的杰作。
Mr Hwee Chong added: "It wasn't as easy as we thought. We went through many rounds of trial and error, painstaking drawing the masterpieces in one controlled line, by hand."
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