1·The story was certainly a favourite one, but it was undoubtedly pure invention.
这个故事的确是人们最喜欢的一个，但毫无疑问它纯粹是虚构的。
—— 《柯林斯英汉双解大词典》
2·While such ways of traveling certainly have their benefits, there are also undoubtedly some disadvantages.
这种旅行方式当然有它们的长处所在，但毫无疑问也有一些缺憾。
3·While such ways of traveling certainly have their benefits, there are also undoubtedly some disadvantages. Here are those which I find to be most significant.
这种旅行方式当然有它们的长处所在，但毫无疑问也有一些缺憾。