It was too late to turn back.回头已经太晚了。They were very nearly forced to turn back.他们差点被迫返回。Don't turn back the corners of the pages to mark your place.别折书页的角来标明你读到的地方....

（使）往回走，翻起，折转，扭转，掉过头来...

turn back的音标：turn back的英式发音音标为：[tə:n bæk]turn back的美式发音音标为：[tɚn bæk]...