一层往往是不够的，然而，在非常多孔表面，一旦第一层失去了它的光泽第二层是必要的。
One coat is often enough, however, on very porous surfaces a second coat is necessary as soon as the first one has lost its glossy appearance.
这些幼鸟的羽毛光泽度不够，颈项僵硬。这样的鸟是没有资格参加比赛的。
The feathers of these babies do not shine and the necks are rough. Birds like these have no chance in the races, regardless the quality.
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