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.
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