1.On Friday, a terrorist gunned down and killed 50 worshippers who were praying at two mosques.
terrorist 恐怖分子
One American was killed and three were wounded in terrorist attacks.
在几起恐怖袭击中,1名美国人被杀且有3人受伤 。
2.New Zealand Police alerted us to a video on Facebook shortly after the live-stream commenced.
alert 警告;警觉
He wanted to alert people to the activities of the group.
他想警告人们注意这个组织的行动 。