可使用性

The allergic and dark skin of sycosis also can have peace of mind the usage.

敏及暗疮性皮肤也可安心使用。

4 All removable internals shall be checked by suitable methods to ensure their insertability and removability through the manhole.

所有可拆除内件均需使用适当的方法进行检查以确其通孔的可嵌入性及可拆除性。