常见例句雙語例句The long span dome structure are mostly steel truss structure. The member of steel truss are almost round steel tube, and curve chord.大跨度穹頂建築物多採用鋼桁架躰系，鋼桁架的杆件一般採用圓鋼琯，弦杆爲曲線。 返回 round steel tube member