Besides barriers and methods ,the students must have learnin

应该改成：Besides the outside barriers and methods, the students must have learned initiative.
如下是详细的解释：
名词 n.
1.外面,外部[the S] The outside of the house is painted white. 房子外部漆成白色.
2.外侧[the S]
3.外表,外观 He has a rough outside but a good heart. 他外表粗鲁,但心地善良.
4.最大限度
形容词 a.
1.外边的,外部的,外面的 The outside walls are brick. 外墙是砖砌的.
2.外来的
3.(可能性、机会等)极小的 There's an outside chance he may come today. 今天他不大可能会来.
4.极限的,最高的
副词 ad.
1.在外面,向外面 There is no light outside of the gate. 大门外面没有灯.
It was raining hard outside. 外边雨下得很大.
2.在室外,向室外
介词 prep.
1.在...外;向...外
Outside the window it was a wonderful spring morning. 窗外是一片美妙的春天晨景.
2.在...范围之外
3.【口】除了...
Phil has no occupation outside these odd jobs. 除了做这些零活外,菲尔无正式职业.