1. All visitors to the site must wear safety helmet. 
   到工地的所有参观者必须带上安全帽。
2. The safety helmet is held on by an elastic strap. 
   安全帽用一根松紧带系住。
3. This way please. Do not forget to put on your safety helmet. 
   请从这边走。别忘了戴好安全帽。
4. It is dangerous to go about on the construction site without a safety helmet. 
   不带安全帽在工地上走来走去是危险的。
5. Along with his or her first bicycle, an American child also receives a safety helmet. 
   当美国孩子得到第一辆自行车时，也会得到一个安全头盔。

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