The plunger in the fully depressed position releases the needle carrier from the end of the barrel and the vacuum pulls the needle carrier and needle into the hollow plunger.
柱塞在完全压下的位置将针头座子从针筒的端部释放，真空将针头座子和 针头推入空心柱塞。
The plunger in the fully depressed position releases the needle carrier from the end of the barrel and the vacuum pulls the needle carrier and needle into the hollow plunger.
柱塞在完全压下的位置将针头座子从针筒的端部释放，真空将针头座子和 针头推入空心柱塞。
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