sun-spot cycle太阳黑子周
sun-spot theory太阳黑子理论;太阳黑子论
sun-spot number日斑数
Sun n spot太阳黑子
sun-spot index number日斑指数
sun spot prediction太阳黑子预测
Sun Island Scenic Spot太阳岛风景区
IN THE SUN SPOT眩目的阳光下
sun spot cycle太阳黑子活动周期
N-COUNT（可数名词） Sunspots are dark cool patches that appear on the surface of the sun and last for about a week. 黑子; 日斑