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单词 s-trap
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S-trap
S-trap n.
Π
1882 S. S. Hellyer Lect. Sci. & Art Sanitary Plumbing iii. 108 About the first form of trap used for fixing under water-closets was the syphon or round-pipe trap, i.e., a pipe bent and recurved in the shape of the letter ?.]
1885 P. J. Davies Standard Pract. Plumbing I. 103 Fig. 205 is the ordinary half ?-trap, wrongly called ?-trap.
1976 R. Day All about Plumbing 64/1 In a ground floor w.c. it is usual to fit an S trap,..but in an upstairs floor w.c., a P trap is usually installed.
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