吃力: (费力) strenuous; laborious; entail strenuous effort; be a strain 短语和例子他学习吃力。 he has difficulty in his studies. 那位伤员吃力地站了起来。 the wounded soldier has made efforts to stand up
爬山涉水: climb hills [mountains] and ford streams; climb mountains and cross rivers; climb up the mountains and cross the streams; traverse mountains and wade through rivers
