Merchants and individuals are free to choose which currencies they accept, and in the absence of legal tender laws I believe that alternative currencies will gain more traction.
商人和个人都可以自由的选择接受哪种货币，而在没有法定货币法存在的情况下，我相信可选择的多货币体系会得到更多的推动。
Traction gas spring also has a corresponding free-type, self-locking type.
牵引式气弹簧中也有相应的自由型、自锁型等。
An eight-node solid element with two parallel faces and one traction-free cylindrical surface is derived using the assumed stress hybrid method.
应用假设应力杂交元的方法，导出了一个八节点的实体元。此元具有二个平行的表面及一个无外力自由的园柱表面。
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