... there is no doubt that毫无疑问 it is well-known that大家都知道 to us all大家都知道 ...
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... It is reported that:据报道 It is well-known that:众所周知 It is asserted that:有人断言 ...
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... The more..., the more... 比较级 It is well-known that 主语从句 Work, the only source of family income 同位语 ...
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