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重点讲解：
1. deliver on 履行；兑现；实现；
They failed to deliver on their promises.
他们没有履行他们的诺言。
2. take out 取得，获得，领到；
Americans can be awarded scholarships or take out subsidized student loans at any age.
美国人可以在任何年纪获得奖学金或补贴学生贷款。
3. because of 因为；由于；
The drainage system has collapsed because of too much rain.
由于降雨过多，排水系统已经彻底瘫痪了。
4. admit to sth./doing sth. （常指不情愿地）承认，供认；
She admitted to having stolen the car.
她供认偷了那辆轿车。
n. 网络，网状物，网状系统
vt. (
