法国和澳大利亚也许没有美国那段流浪艺人涂黑脸表演的特殊历史…但这种把一名白人女子涂成黑色的行为，应该给某些人敲响警钟。
France and Australia may not have the United States' particular history of minstrel shows... but something about the act of portraying a white woman as black ought to sound an alarm, somewhere.
这份报告并不是第一个对美国薄弱的历史教学拉响警钟的。
The report is by no means the first to sound an alarm about nationwide weaknesses in the teaching of American history.
这一段历史再次为公共卫生工作者敲响了警钟：防病有风险，接种需谨慎。
The episode highlights a point familiar to public health workers: Prevention never comes without risk.
自从一月官方正式宣布了这个改造计划以来，历史学家一直对此项目敲着警钟。
Since the project was announced in January, historians have been sounding the alarm.
自从一月官方正式宣布了这个改造计划以来，历史学家一直对此项目敲着警钟。
Since the project was announced in January, historians have been sounding the alarm.
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