An occasional short ride is unlikely to cause trouble.

偶尔一次短途骑车不大可能造成麻烦。

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The ones with smooth tops are the ones that have rolled over: some of these cause tsunamis powerful enough to wash the occasional unwary Danish tourist off the beach and away to an icy death.

顶部平滑的那些冰块就是已经翻转过了的：有些碎冰能引发强有力的海啸，把不经常来的丹麦旅游者从岸上卷入海中，这些旅行者往往把不知警惕，这就造成了冰发死亡事件。

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A mild case of dust mite allergy may cause an occasional runny nose, watery eyes and sneezing.

轻度的螨虫过敏可能只是偶尔的流鼻涕，流眼泪，打喷嚏。

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An occasional reminder of reality helps against the delusions of power that cause most wars.

CENTERFORSECURITYPOLICY: Center For Security Policy