Smith's parents have had to hospitalize her four times with bronchitis since they moved into the trailer a year ago and they say they are sure the trailer is to blame for her illnesses.
自打他们一年前搬进拖车里住，小史密斯就有四因为患有支气管炎被送进医院，史密斯夫妇称，他们的居住环境是孩子发病的主要原因。
The utility model relates to a hydraulic double-side self-tipping four-wheel trailer which belongs to the technical field of agricultural machinery and uses the original hydraulic system of a tractor.
一种液压双侧自卸四轮挂车属农牧机械技术领域，它用机车原有的液压系 统。
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