N1-Hang in here.坚持住
N2-On the right track.走在正确的道路上
N3-Give it your all/Give it your best shot.全力以赴
N4-Keep your chin up.别灰心
N5-Way to go.真棒
N6-Keep up the good luck.再接再厉
Learning is like rowing upstream, not to
advance is to drop back.
“学习如逆水行舟，不进则退。”