But for their help, we would not have succeeded in this experiment.
没有他们的帮助，我们这项实验就不会成功。
Not discouraged by failures, they went on with their experiment and finally succeeded.
没有因为失败而灰心，他们继续作实验，终于成功了。
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。
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