To avoid duplication of effort and wasted time and resources, it is essential that such information is available.为避免人力的重复以及时间和资源的浪费，必须向人们提供这类信息。He must have thought Jane was worth it or he wouldn't have wasted time on her, I suppose.我想，他一定认为简值得他这么做，否则他不会在她身上浪费时间。