Because of particularity of structure and material, the piston must be measured by the non - contact method. but, at present there isn ' t mature technique.
由于活塞结构和材料的特殊性，对于它的检测只能采用非接触测量的方法，而目前尚没有成熟的技术。
Girl: No, there isn 't. but there's a post office.
女孩：不，没有。但附近有一个邮局。
There isn′t the concept of "self" in Chinese Classical Taoist School, but there are abundant thoughts of self.
中国古典道家中并没有“自我”这一概念，但却拥有丰富的关于“自我”的思想。
There isn"t much tea, but we only need a little for a cup of tea."
没有多少茶叶了，但是我们只需要一点儿泡杯茶。
There isn"t much tea, but we only need a little for a cup of tea."
没有多少茶叶了，但是我们只需要一点儿泡杯茶。
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