E. After the skin has been punctured, with the bevel of the needle upward, expel the skin plug that may occlude the needle.是什么意思_E. After the skin has been punctured, with the bevel of the needle upward, expel the skin plug that may occlude the needle.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句