You can't just count upon one single person to get the work done properly.
单指一个人是不能把事情做好的。
《新英汉大辞典》
2
Obviously, it is far easier to count the number of vaccines, bednets, and medicines distributed by single-disease initiatives than it is to measure the impact of WHO’s technical work.
显而易见，对通过单一疾病行动分发的疫苗、蚊帐和药物进行计数要比衡量世卫组织技术工作的效果容易许多。
3
Today I am 39, with too many ex-boyfriends to count and, I am told, two grim-seeming options to face down: either stay single or settle for a “good enough” mate.