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。
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。
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。
In an occasional woman, having too much stress can change her hormone levels and therefore cause the time when she releases an egg to become delayed or not take place at all.
女性偶然压力太大会使激素水平变化，导致排卵时间延迟或不排卵。
In an occasional woman, having too much stress can change her hormone levels and therefore cause the time when she releases an egg to become delayed or not take place at all.
女性偶然压力太大会使激素水平变化，导致排卵时间延迟或不排卵。
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