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- two ring piston 双环式活塞
- At the same value of frequency and size, the directivity of quadrate ring piston is sharper than that of quadrate piston. 在同一声波频率以及相同尺寸的情况下，方环活塞声源要比方形活塞声源的远场指向性更尖锐。
- A Flat-Top Interleaver Based on a M-Z Interferometer with Two Ring Cavities[J]. 引用该论文 张婷;赵帅;陈凯;李勇男;盛秋琴.
- There were only two rings of rope spooled on the drum. 只有两圈绳子绕在卷轴上。
- In this paper, the radiation pressure and directional formulation are calculated by use of Reily-integrate, The directivity of radiated sound field of quadrate ring piston is analyzed. 摘要利用瑞丽积分，计算了方环活塞声源远场的辐射声压分布以及指向性公式，并对辐射声压的远场指向性进行了分析；同时，与方形活塞声源的指向性作了对比。
- Table light with stainless steel discs; hoop mounted on a two ring steel structure on steel base. 不锈钢片材质台灯，环绕悬挂于钢制支架的双钢圈上。
- Abstract: Large drums with supporting wheels at its ends and two ring ribs are commonly used on large cranes, shiplifts and elevators for mines. 文摘:用于大型起重机、升船机和矿山提升机等领域的大型提升卷筒，常采用设有两道环筋，左右两侧有支轮支承的结构形式。
- There is a shower/WC and a small kitchen in the apartment with a refrigerator, two ring stove, electrical and microwave ovens, a coffee-maker. 工作室单间面积为23平方公尺，洁净清爽。
- Double-acting PTFE slide ring piston seals 双冲程PTEF滑动环活塞密封
- South near and Xi"an transportation aorta south two link connected construction work road, east near park south road, east westing two ring circuits not to 1 kilometer. 南临与西安交通主动脉南二环相连的建工路，东临公园南路，西距东二环路不到1公里。
- Double-acting polyurethane slide ring piston seals 双冲程聚亚胺酯滑动环活塞密封
- Diamondbacks tail of the cutting-edge, a long horn loaded chain ring, has become a hollow tube, then hollow cuticle separated into two ring vacuoles, as if the two air oscillator. 响尾蛇尾巴的尖端地方，长着一种角质链装环，围成了一个空腔，角质膜又把空腔隔成两个环状空泡，仿佛是两个空气振荡器。
- The two systems of government are polar opposites. 这两种政体正好相反。
- In fused-ring and bridged-ring compounds two carbons are common to the two rings. 在稠环和桥环化合物中,两个碳原子是两个环公用的。
- The directivity of acoustic field radiated from ring piston source 环状活塞声源辐射声场指向性研究
- The business is owned by two partners. 这家商行为两名合伙人所拥有。
- Cast four gold rings for it and fasten them to its four feet, with two rings on one side and two rings on the other. 也要铸四个金环,安在柜的四脚上;这边两环,那边两环。
- And they made two ouches of gold, and two gold rings; and put the two rings in the two ends of the breastplate. 又作两个金槽和两个金环,安在胸牌的两头。
- And they put the two cords of gold in the two rings at the ends of the breastplate. 17把那两条拧成的金链子，穿在胸牌两端的环子里。
- A number of designs use two rings of stubby, counter-rotating blades made from composite materials. 有许多设计采用了两圈短而粗的、反向对转的采用复合材料制作的叶片。
