However, the fact that the planes are made out of metal will increase their radar return and make it very hard to completely mask them, Hill said.
然而，飞机是由金属制成的事实将会增强它们返回到雷达的信号，以致使飞机很难完全被遮盖，希尔说。
For this particular layer mask I don't want to create a hard edge so we are going to use the brush tool to manually create our mask.
对于这个层蒙版，我不想有硬边。所以我们选画笔工具手工建立蒙版。
Our drugs aren't candy, it's really hard to mask the taste of medicine through micro-encapsulation.
我们的药品不是糖果。很难通过微胶囊技术掩盖药品的味道。
My skin looks nice and smooth, but I had to rub quite hard to get the mask off, even with a washcloth.
使用后我的皮肤看起好极了。虽然我使用毛巾来擦，但我还是觉得擦干净有点难。
My skin looks nice and smooth, but I had to rub quite hard to get the mask off, even with a washcloth.
使用后我的皮肤看起好极了。虽然我使用毛巾来擦，但我还是觉得擦干净有点难。
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