Neuromuscular block was monitored using train-of-four stimulation by a muscle relaxation monitor(TOF Watch SX).

使用肌松监测仪进行拇内收肌连续四个成串刺激（TOF）肌松监测。

youdao

Construction in that area has reduced the number of active train tracks from four to two over a seven-mile stretch there since March 2012.

WSJ: Rail Corridor Hit With Major Outage

One great journey is to the hills outside of Yonezawa, in Yamagata prefecture, four hours north of Tokyo by train.

CNN: ASIANOW - Travel Watch | Offbeat Onsen Offer Tradition with a Twist

Limited subway services returned to New York on Thursday, though four of the seven train tunnels under the East river remained flooded.

BBC: Storm Sandy: US death toll close to 100