• 唯一原因

single hop单段singleadj.单一的；单个的；特指某人或某物；单身的；单人的；单程的n.单程票；单曲；单人房间；单身者；<美>一元纸币；(网球)单打比赛；(板球)一分打；(棒球)一垒打v.挑选(一个)single-office exchange单局交换,单中心交换站single-fault to ground单相接地故障single-base propellant单基药single in-line package单列直插式封装single core--drawing单个抽芯single electron transfer单电子转移single beam transit tube单束渡越管single roll coal crusher单辊碎煤机single tone interference单音干扰Single Hole Oxygen Lance记住选择和默认

1. Many theories purport to explain growth in terms of a single cause.
   许多理论都标榜以单一的原因解释生长。
2. Such a taxation system which featured colonialism led to the establishment of an abnormal single - structured economy in French Indochina.
   这一具有浓厚殖民主义色彩的税收体制是法属印度支那畸形单一经济结构形成的主要原因之一。