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It's a nightly dilemma in many households: A student hits a wall doing homework, and parents are too tired, too busy -- or too mystified -- to help. 许多家庭每天晚上都会遭遇这样的困境：孩子做作业时有道题不会，这时家长要么太累，要么太忙──要么也不会──总之帮不上忙。 Ordering up a tutor is becoming as easy for kids as grabbing a late-night snack. Amid rapid growth in companies offering online, on-demand tutoring, students can use a credit card to connect, sometimes in less than a minute, with a live tutor. Such 24/7, no-appointment-needed services can be especially helpful to students with tight budgets or tight time frames or those in remote areas. 而如今对孩子们来说，在线订购辅导服务正变得和拿点儿零食当宵夜一样容易。随着越来越多的公司提供按需定制的在线辅导，学生们用一张信用卡便可快速地接通一位在线家教，有时1分钟都不到就能连上。这类服务每周每天不间断运营，且无需进行预约，尤其对手头紧、时间急、住得远的学生来说很有帮助。 'All of a sudden, the world opens up to them,' says Michael Horn, executive director of education for the Clayton Christensen Institute, a San Mateo, Calif., education and health-care think tank. 加州圣马特奥教育健康智囊团Clayton Christensen Institute的执行董事迈克尔·霍恩(Michael Horn)如此评价：一瞬间，知识的海洋就向他们敞开了怀抱。 | 
