Before looking at the test code, you need a better understanding of the Rails user interface layer.

在查看测试代码之前，需要对Rails的用户界面层有更好的理解。

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Step 4: Create a new layer by clicking the paper-looking icon at the bottom of the Layers palette (circled in red below).

第四步：点击图层面板中像纸片一样的那个图标，建立一个新图层。

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For the deepest layer, the hypodermis, he is looking at taking fat from the abdomen and injecting under the healing wound.

BBC: US Army seeks new ways to treat facial skin injuries