本期内容：
"Catastrophic" flooding in the US state of Texas is only expected to worsen in coming days as waters rise following a storm of historic proportions. A record 30 inches of rain has already fallen on the city of Houston in the wake of Hurricane Harvey, turning roads into rivers. But forecasters say that number could nearly double later this week. On Monday President Donald Trump also approved an emergency declaration for neighboring Louisiana.

Catastrophic：灾难性的
Worsen：变坏
Proportions: 规模
In the wake of: 尾随其后
Emergency declaration：宣布紧急状态



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