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
啃: 动词1.(一点一点儿地往下咬) bite; gnaw; nibble 短语和例子啃老玉米 nibble at an ear of corn; 把骨头上的肉啃下来 bite meat off the bone; gnaw the meat off a bone; 老鼠能啃穿木头。 a rat can gnaw a hole through wood. 他在啃苹果。 he wa