四咪唑分子具有光学活性，为了确定旋光度的大小和方向，使用传统方法既耗时又不经济。
The tetramisole molecular have optical activity. The traditional method is time and cost consuming to decide the rotatory direction and the value of optical rotatory.
推销员欺骗了我——那辆汽车结果既不经济又不牢靠。
I was taken in by the salesman - the car turned out to be uneconomical and unreliable.
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