表示总结：(summary)

　　in conclusion;

　　in short;

　　in brief;

　　in summary;

　　on the whole;

　　finally;

　　to sum up;

　　to conclude.

　　表示开场：(introduction)

　　generally speaking;

　　comparatively speaking;

　　in general;

　　in a sense;

　　in a way;

　　in my opinion;

　　in some cases;

　　nowadays;

　　recently;

　　currently;

　　obviously;

　　clearly;

　　undoubtedly;

　　why young women don't want to have children.