They created the first doublehelixmodel of DNA in 1953. Photograph: ap.
他们在1953年构建了第一个DNA双螺旋结构。
2
The doublehelix-type hollow fiber film device of the utility model has the advantages of high mass transferring efficiency, large feed liquid handling capacity and simple preparation and the like.
本实用新型设计的双螺旋式中空纤维膜器,具有传质效率高,处理料液量大,制备简单等优点。
3
The utility model comprises a doublehelix filament body and filament pins integrally arranged on both ends of the filament body, the filament pins are respectively straight line filament pins.