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不带针头的注射器-用来收集水银。
Syringe without needle - to pick up mercury.
youdao
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注射器吸满漱口液，接上针头，排出注射器内空气。
Fill the syringe with solution, attach the needle and expel air.
youdao
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注射器吸满漱口液，接上针头，排出注射器内空气。
Fill the syringe with solution, attach the needle and expel air.
youdao