They sang without instrumental accompaniment — or, more accurately in their case, without any interference.
他们唱歌没有乐器伴奏——在他们这种情况下，更正确地说，是没有干扰。
2
Case classification is instrumental to enhancing overall medical quality and regulating medical behavior in hospitals.
病例分型对提高医院医疗质量管理和规范医疗行为有重要价值。
3
Combining with teaching practice, case teaching method used in experiment of instrumental analysis was discussed on accelerating cultivation of practical talents.