n the fifth day of the week; the fourth working day
n a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
abbr. 混合动力系统（Toyota Hybrid System）；高速列车；变速箱液压开关（Transmission Hydraulic Switch）；总加热面（Total Heating Surface）