您要查找的是不是：
- a unidirectonal flow; a unidirectional antenna; a unidirectional approach to a problem. 单向流速；单向天线；解决问题的唯一方法。
- a unidirectional antenna 一种单向天线
- Events in the world undeniably form a unidirectional sequence. 无可否认的，世界上发生的事件只有单向的顺序。
- Planar Archimedean antenna can work in a very wide band, while the wideband matching network is difficult to be implemented, especially in adding a reflecting cavity to get a unidirectional radiation. 平面阿基米德螺旋天线具有极宽的工作频带,然而其匹配平衡电路的宽频带实现则较难,尤其是在加反射腔以使其单向辐射时。
- There is a unidirectional causality from industrialization to environment. 存在从工业化到环境的单向因果关系。
- A unidirectional bezel only turns one way to prevent any danger of false manoeuvre. 单向表圈只能朝一个方向转动以防止发生错误操作。
- Ice crystals begin to deform measurably under a unidirectional pressure of slightly less than one atmosphere. 在略小于一个单向大气压的压力下，冰晶就产生某种程度的变形。
- To reverse the direction of(an alternating electric current)each half - cycle to produce a unidirectional current. 变换电流方向颠倒每一半周(交流电流的)方向，以产生单方向性电流
- To reverse the direction of(an alternating electric current) each half-cycle to produce a unidirectional current. 变换电流方向颠倒每一半周（交流电流的）方向，以产生单方向性电流
- PCI is a unidirectional parallel bus architecture in which multiple adapters must contend for available bus bandwidth. PCI是一个单向的并行总线架构，其中多个适配器必须争夺可用的总线带宽。
- The optical bistable behavior of V-type three-level atomic system in a unidirectional ring cavity driven by a coherent field is studied. 摘要研究在一单向环形腔内的V-型三能级原子被一相干光场驱动的光学双稳态行为。
- The monophasic models advocate a unidirectional water flow, taking the whole symplast of root as a semi permeable membrane. 单相模型不强调水流方向，基本上只将根中的共质体作为一层连续的半透膜看待。
- Therefore, we proposed a unidirectional amplification scheme which facilitates bidirectional transmission by using an interleaver. 因此我们提出了利用间隔器组成一个单向放大路径的结构用以达成双向传输的效果。
- At present, the conventional rock body mechanical test comprises a unidirectional compression test, a unidirectional tension test, a triaxial compression test and a shear test. 目前常规的岩体力学试验主要有单向压缩试验，单向拉伸实验，三向压缩试验，和剪切试验等。
- There is a vein of melancholy in his character. 他的性格中有少许忧郁的气质。
- There was a long lag in forwarding mail to us. 转寄给我们的邮件晚了很久才拿到。
- A unidirectional microphone. 单向性的麦克风
- A bowl of hot chicken soup is good for you. 喝一碗热鸡汤对你有好处。
- A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
- A country must have the will to repel any invader. 一个国家得有决心击退任何入侵者。
