罗瑟斯塔研究所的研究人员重新设计了蜘蛛运动模式，让最强韧的用来四处活动和阻挡猎物的牵引丝具有弹性和柔韧性。
Researchers at Rothamsted Research redesigned the model to allow for elasticity and flexibility in the spider's dragline, its most sturdy line of silk used for moving about and snagging prey.
从这方面来说，如果你采用一个有效的邀请机制，免费商业模式可以帮助你获得牵引力。
In this case, Freemium can help you gain traction if you use an effective invitation mechanism.
它可拥有一个连续挤压的模式，因为有柱锭焊接技术，还有牵引系统和其它自动化的挤压配套设备。
The continuous extrusion model with welding dies functions well with puller systems and other automated handling equipment.
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