第二段还包括近端支点，它与针接合以便于防护件延伸。
The second segment further includes a proximal fulcrum that engages the needle to facilitate extension of the shield.
一种注射器(1)，包括筒(2)，一柱塞(3)可滑动且密封地接合在该筒中，并且针结合到筒(2)的一端。
A syringe (1) comprises a barrel (2) with a plunger (3) in slidable and sealing engagement therein, and a needle attached to one end of the barrel (2).
该平面构成用来接合所述针以便将该防护件设置在延伸位置中。
The planar surface is configured to engage the needle for disposing the shield in an extended position.
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