您要查找的是不是：
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- The inner layer of the wall of a spore. 孢子内壁孢子壁的内层
- Helium and neon are inert gases. 氦和氖为惰性气体。
- There is a fine layer of dust on the desk. 桌子上有一层薄薄的尘土。
- The middle, usually fleshy layer of a fruit wall. 中果皮果皮中间通常含肉较多的那一层
- The bottom layer is a mixture of sand and clay. 最下面的一层是沙和泥的混合物。
- A fine layer of dust covers everything. 所有的东西都盖了一层薄薄的灰尘。
- The antimatter equivalent of helium. 反氦与氦等价的反物质
- helium layer 氦气层
- Helium was discovered on the sun. 氦是在太阳上发现的。
- A layer, as of doubled-over cloth or of paperboard. 一层一层，如折叠过的布料或纸板的
- Most big balloons are now filled with helium. 现在许多大气球中充的是氦气。
- A surface, layer, or mass of frozen water. 冰面冻结的水的面、层或块
- A fountain of helium spurt out of the tube. 有一股氦的喷泉从小管中喷出。
- A thin layer of bone, membrane, or other tissue. 骨骼、粘膜或其它组织的薄层
- Helium is a gas used in balloons. 氦是一种用于气球的气体。
- Atoms of hydrogen are fused to make helium. 氢原子可熔合成氦。
- A thin, flat layer or scale, as that of a fish. 外表组织薄而平的一层或鳞状物，如鱼鳞
- The element of helium was first found in the sun. 氦元素最初是在太阳里发现的。
- You can be a helium hea without even trying. 你真是个大傻瓜，甚至连试都不试一下。
