Sterad
球面(角)度, 立体角度的单位
🗣️ 情景例句
but it'll take you ten minutes longer.
但会多花你十分钟的时间。
Do you usually work at the restaurant after school?
你通常在放学后在餐厅工作吗？
local epidemics of this disease could be created.
就可以使这种疾病在一个地区蔓延起来。