The report says the biggest single failure was the World Health Organization's delay in sounding the alarm about the outbreak.

报告中称，此次疫情爆发的最大失误是世卫组织没有能够及时作出预警。

We have long syllables and short syllables, and speaking with that contrast is really important in sounding natural in American English.

我们有长音节和短音节，了解这个非常的重要会让你说的美国英语听起来更自然。

While he was explaining, we could hear in a neighboring street a blacksmith hammering on his anvil, and in the house opposite, a woman singing to lull her baby to sleep; far away, in the Cernaia barracks, the trumpets were sounding.

在先生接着讲课的时候，我们耳中听见近处街上铁匠打铁声，对门妇人安抚婴孩睡熟的儿歌声，以及兵营里的喇叭声。