... extension spring 牵引簧,拉伸弹簧... extension tripod 伸缩三角架 extension well 蔓延井,探边井...
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... 伸长式测微计，伸长式千分尺 extension spring 牵引簧 extension tripod (1)外接镜管(2)附加遮光管 extensometer ...
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aluminum extension leg tripod 铝制伸缩三脚架
tripod extension 三脚架接座 ; 伸缩脚架
Bilogical Tripod Extension 天线三脚架
extension n tripod 伸缩三脚架
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