1·What is this black powder on your desk?
你桌子上的黑色粉末是什么？
2·Porperties: Brown black powder, solve in water and mellow.
性状：棕黑色粉末，溶于水和醇。
3·But then I saw that he had a bit of black powder on his fingertip.
不过，接着我就看见他指尖上有一撮黑色粉末。
4·In other smuts the spores form an uncovered mass of black powder.
在另一些黑粉病中孢子形成无覆盖的黑色粉末。
5·Mixture of black powder and magnesium has a tendency to segregate.
黑药和镁的混合物具有离析的倾向。
6·Mixture of black powder and magnesium have a tendency to segregate.
黑药和镁的混合物具有离析的倾向。
7·Mixture of black powder and magnesium have a tendency to segregate .
黑药和镁的混合物具有离析的倾向。
8·It is made of extremely rugged heavy-gauge black powder-coated steel.
它是由非常坚固重轨黑色粉末涂层钢板。
9·Light black or black powder, water and alcohol insoluble, but acid soluble.
灰黑或黑色粉未，不溶于水、乙醇，溶于酸。
10·Powder (for non-porous surfaces) : Metallic silver powder or velvet black powder.
粉末：银色粉末和黑色粉末。