1. Determines the significance, importance, usefulness or value of. 确定…意义、重要性、有效性或价值。
2. Shared networks can potentially improve the usefulness and efficiency of communications systems, but they also create competition for communal resources. 共享网路或许能提高通讯系统的用处与效率，但也造成大家对共有资源的竞争。
3. The company's Freedom brand "Gabriel" flat emery cloth round of series regardless of workmanship, appearance, or usefulness of speaking, have reached the most advanced production standard. 本公司的自由品牌“百利”平面砂布轮系列无论做工，外观，还是实用程度上来讲，都达到了国内最先进的制作水平。
