And for every hour she spends studying, she gives up an hour that she could have spent napping, bike riding, watching TV, or working at her part-time job for some extra spending money.

并且，每一小时她都用来学习，放弃一个小时她可以打盹，骑自行车，看电视，或做一份能为她带来额外花销的兼职。