1.He wants to "stem the risk of many children and teachers becoming infected through gathering for long hours every day".
stem 阻止
The government had failed to stem the tide of factory closures.
政府沒有控制住工廠紛紛倒閉的勢頭 。
2.What's the point of closing schools if parents are still commuting in packed trains in which passengers may have COVID-19?
commute 通勤
She commutes from Oxford to London every day.
她每天上下班往返于牛津與倫敦之間 。