问题: 知道大概的意思，只是还想知道更进一步的，所以请翻译
U.S. markets joined stock exchanges around the globe that have fallen precipitously in recent days amid concerns that a downturn might spread around the world. U.S. bonds were mixed
解答:
If this is the latest news, it means the US stock markets reopened after it was closed on the Martin Luther King's day (01/21/08) and the stocks plunged as other stock markets around the workd did because of the fears of recession in America that will affect other countries' economies.
Some bonds did better others, which means prices for some closed higher and others lower.
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