In addition to partial eclipses, sky-watchers may see two other types of solar eclipses in a given year: total and annular.
除了日偏食之外，空中的观测者在这一年中可能还会看到另外两种日食：日全食和日环食。在日全食发生时，月亮会完全遮挡住太阳。
But the lessening of virtual breadth of the annular electrode makes the radial distribution of plasma density more unequal, and the total density and the average temperature lower.
但环电极有效宽度的减小使得等离子体密度的分布更不均匀，并使总的密度和平均温度均下降。
At the end of the annular passage, shock wave occurs when the relative lift is less than 6% and the pressure ratio is less than 0.7, which causes a greater total pressure loss.
在相对升程小于6%、压比小于0.7后，环形通道的末端将产生激波，激波带来较大的全压损失。
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