头难，读音是tóu nán，汉语词语，意思是凡事开头难做。
那就意味着如果一头熊想要追击猎物，那么即使是世界短跑纪录的创造者尤塞恩博尔特也难以幸免于难。
That means if a bear decides to give chase, even Usain Bolt, the world record sprinter, could not outrun it.
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；
Powdered carbon can clean away fingerprint, oil stain on lens, and do not scratch or damage lens.
“一对一的面试就够难的了，更何况是坐在摄像头和话筒前。” 复旦大学法学系大四学生，22岁的唐一磊（音译）说。
"It's hard enough doing face-to-faceinterviews, let alone sitting in front of a camera and microphone, " said Tang Yilei, 22, a senior majoringin law at Fudan University.
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