目的关系：with this object; for this purpose; in order that; in this way, since; so that; on that account; in case; with a view to; for the same reason.
重申关系：in other words; that is to say; as I have said; again; once again.
结果关系：accordingly; thus; consequently; hence; therefore; thereupon; inevitably; under these conditions; as a result; as a consequence; because; because of; so that; not only...but ; so... as to.