Passage 3Since World War II, there has been a clear trend, especially among the growing group of college students, toward early marriage. Many youths begin dating in the first stages of adolescence (青春期), “go steady” through high school, and marry before their formal education has been completed. However, emotional maturity is no respecter of birthdays; it does not arrive automatically at twenty-one or twenty-five. Some achieve it surprisingly early, while others never do, even at the age of sy.　　Many students are marrying as an escape from their own personal problems of loneliness. However any marriage entered into as an escape cannot prove entirely successful. The sad fact is that marriage seldom solves one’s problems; more often, it merely makes them worse. Furthermore, it is doubtful whether the home as an institution is capable of carrying all that the young are seeking to put into it. Young people correctly understand that their parents are wrong in believing that success is the ultimate (最终的) good, but they mistakenly believe that they themselves have found the true center of life’s meaning. Their expectations of marriage are essentially unrealistic, and therefore incapable of fulfillment. They want too much, and disillusionment (幻想) is often sure to follow.　　Shall we, then, think early marriages are bad? One cannot draw the conclusion that all early marriages are bad or all later ones are good. Satisfactory marriages are determined not by age, but by the emotional maturity of the partners. Therefore, each case must be judged on its own merits. If the early marriage is not an escape, if it is entered into with relatively few illusions (幻想) or false expectations, and if it is economically practical, why not? Good marriages can be made from six to sixty, and so can bad ones.Since World War II people tend to marry early for the following reasons except that ________.