subcutaneously
  (ad.)皮下地
  Sub·cu·ta·ne·ous a. Situated under the skin; hypodermic. -- Sub*cu*ta*ne*ous*ly, adv.
  Subcutaneous operation Surg., an operation performed without opening that part of the skin opposite to, or over, the internal section.
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  subcutaneously
       adv : below the skin; "inject subcutaneously"