软件开发在过去三十年里已经是非常一致。
Software development has been remarkably consistent over the past thirty years. There have been refinements along the way, of course, but the basic themes are the same.
在过去三十年里，我们国家经历了巨大的变化。
Our country has experienced great changes in the last 30 years.
在过去三十年里，其他四次联邦调查都无法阻止这个下降趋势。
Four other federal inquiries held over the past three decades have failed to halt the decline.
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