関連ワード:  give one example of a push factor    give an example of a push factor    give an example of a push factor in rural china    give one example of a pull factor    what is an example of a push factor    give an example of a pull factor    what is an example of a push factor in migration    what is an example of a push factor for immigration    what is an example of a push factor in geography    what is an example of a push factor that might compel people to leave their home country