The dreadful floods this year and last showed that untamed and unpredictable rivers can be both resource and threat.

去年和今年的洪灾表明，那些未经治理的河流既是资源又是威胁。

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Marine Le Pen's far-right National Front remains an added, unpredictable, threat.

ECONOMIST: French politics

"A combination of technology, intelligence and passenger profiling will help build a more robust defense against the unpredictable and changing nature of the terrorist threat to aviation, " BAA, which runs Britain's largest airport, announced in a statement.

CNN: UK to tighten airport security after failed bombing