二重心理学，一种调和折中的心理学，认为心理学应研究兼括内容与意动的广义经验。

dual aspect convention【会计】

dual-rate moon camera

dual function

dual-gap read-after-write tape head

dual ball check valve

dual rate system

dual-powered trolley bus【车辆】

dual clearing of both qi4 and the blood