“三北”防护林

three-way tube

analytical three-point resection radial triangulation【测】

three-seater【家具】

three way stopcock

3-D picture【电影】;stereoscopic motion picture【电影】;three-dimensional film【电影】

three-quarter crown

iterative three-stage least squares estimate【数】;iterative three-stage LSE【数】

three-sulfonated polymer salt mud