20.if you don't go after what you want，you ' ll never have it . if you don ' t ask，the answer is alwaysNo。if you don不开口，答案总是No。不往前走，永远原地21。face the past with the least regrets，face the present with the least waste and face the future with the most dreams。不后悔过去，不抛弃现在。充满梦想，面对未来。