1. Complicated as a modern machine is , it is essentially a combination of simple machines. 
   现代机器虽复杂，但实质上不过是简单机械的组合。
2. combination excavator and hauler 
   铲土运输机械
3. a complicated problem; complicated Middle East politics. 
   棘手的难题；复杂的中东政局。
4. Having complicated nutritional requirements. 
   有很复杂的营养要求的
5. It seems too complicated. 
   这听起来相当复杂。

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