30 高低 [-] gāodī (high-low) height, pitch: 不分~ not separate by height || 收入 ~ salary level || 地位/分数~ place, ranking ' 17 相隔 [-] xiānggé (mutual-separated) separate by: ~不远 separated by a long distance || ~两年 separated by two years || 与外界~ separated from the outside world '