Ulcers
n. 溃疡, 疡（ulcer的复数）
🗣️ 情景例句
Things here work very differently from back home.
这里的情况与你国家的情况有很多不同。
Do you think it's going to rain tomorrow?
你认为明天将下雨吗？
But suppose the earth could be covered with sensors spaced one foot apart,
假设地球上可以布满传感器，每个相隔1英尺，