Ever since early this century, electricity has become an essential part of our modern life.
自本世纪初，电成为了我们的现代生活的一个主要部分。
Ever since early this century, electricity has become an essential part of our modern life. It has played a decisive role in the modern world.
第一段的段首句是讲电已经成为人们现代生活中必不可少的部分，因而接下来的续写部分应强调它的重要性。
This has remained a puzzle ever since. It complicated attempts to segregate the races in the early 20th century.
这个问题一直以来都没有答案，20世纪初期的种族隔离措施也因此举步维艰。
This has remained a puzzle ever since. It complicated attempts to segregate the races in the early 20th century.
这个问题一直以来都没有答案，20世纪初期的种族隔离措施也因此举步维艰。
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