1. 费劲地阅读, 吃力地钻研,艰难地通过：49. recipient adj.容易接受的,感受性强的n.容纳者,容器 | 50. plough through费劲地阅读,吃力地钻研,艰难地通过 | 51. come to v.达到,继承,复苏,停止,想起,共计
2. 费力的阅读：78. out of date 过时 | 79. plough through 费力的阅读 | 80. be through 完成
3. 费力地通过...;费劲的阅读,吃力地钻研：play with以...为消遣,玩弄 | plough through费力地通过...;费劲的阅读,吃力地钻研 | point of view观点
4. 跋涉;奋力前进;钻研：25.lose interest in... 对......失去兴趣 | 26.plough through... 跋涉;奋力前进;钻研 | 27.illustrate...with... 用......举例说明
1. Once Dong had to drive three hours and than had to hire a tractor to plough through the deep snow.