1. 回声：Reduction 压缩,衰减,形成 | Reecho 回声 | REF Reference 说明书,参考,基准,定位
2. 再反回响 使回响 回响, 回声：distillate spirits 白酒, 蒸馏酒 | reecho 再反回响 使回响 回响, 回声 | be poles asunder as wide as the poles apart 相差很远, 截然相反, 南辕北辙
3. 回响：INSTRUMENT 乐器(插孔) | REECHO 迴响 | REPEAT 反復
4. 回声的回响; 再发回声;回声反射：REE 稀土元素 | reecho 回声的回响; 再发回声;回声反射 | reed cast 芦苇铸型
verb
1. repeat back like an echo
2. repeat or return an echo again or repeatedly
send (an echo) back
3. echo repeatedly, echo again and again