hold in
  克制,控制;防止
  hold in
       v 1: close in or confine [syn: enclose, confine]
       2: lessen the intensity of; temper; hold in restraint; hold or
          keep within limits; "moderate your alcohol intake"; "hold
          your tongue"; "hold your temper"; "control your anger"
          [syn: control, hold, contain, check, curb, moderate]
       3: hold back; keep from being perceived by others; "She
          conceals her anger well" [syn: conceal, hold back]