就这样，我开始了一个全新的职业生涯，由于自己的不懈努力事业慢慢有了起色。
现在席卷世界的艾滋病的祸害很有可能由于全世界科学家和研究人员的不懈努力在未来几年内得到控制。
The scourge of HIV/AIDS currently engulfing the world will quite likely be brought under control within the next few years thanks to the untiring efforts of scientists and researchers worldwide .
大卫说他们公司之所以获得成功是由于全体员工的团结和坚持不懈努力工作的结果。
David attributed his company's success to the unity of all the staff and their persevering hard work.
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