更沉重的壳：锈蚀斑斑的波浪形铁，坍塌的墙，或是留在好望角巨大的混凝土块，人工做的悬崖，用古代的金属丝做成的胡子等等。

Heavier coverings: rusting corrugated iron, broken-down walls, or at Hope cove giant concrete blocks, mimicking the cliffs, whiskered with antique wire.

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现在， 新的模型使用漂亮的， 有光泽的镀铬六角形镙丝。

Now, new models use nice, shiny chrome, hex - head screws.

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目的研究“摇椅形”弓丝对前牙开牙合畸形的矫治效果。

Objective To study the effect of the application of reverse-curve arch wire for the treatment of anterior open bite.

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