Hardest to find is cooking oil, but chicken, powdered milk and cheap varieties of cheese, along with sugar and meat, are also scarce.
最难找到的是食用油，不过鸡肉、奶粉和各种廉价奶酪，以及糖和肉也很少。
Powdered carbon can clean away fingerprint, oil stain on lens, and do not scratch or damage lens.
碳粉头更可清除镜片上难清洁的指印、油污等顽固污渍，且不会刮花、损伤镜头；
A new method was built to determine the POV of powdered oils by broking the wall with ultrasonic and then extracting the oil to determine the POV.
建立了一种简单、重复性好的超声波破壁提油测定粉末油脂中油脂过氧化值的新方法。
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