On holidays the lake in the park is often blocked by pleasure boats.

假日里，公园的湖上常常挤满了游艇。

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That meant bouncing over pebbly dirt shoulders and narrow sidewalks often blocked by parked cars and market stalls, edging onto the road only when there was a lull in the nearly constant scooter buzz.

这意味着我要不断地跃过卵石与泥土砌成的路肩，还有总被停放车辆与集市小摊阻塞的狭窄人行道，只有在几乎不绝于耳的摩托车轰鸣声偶有间歇时，才能缓缓地驶上路面。

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Once the water distributor on the bottom of UASB is often blocked, when operating in practice, the uniformity of water distribution is destroyed.

厌氧反应器uasb在实际运行中，其底部的布水器经常出现堵塞，从而造成了配水的不均匀。

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Cards are often blocked when the volume of transactions for which they are used abruptly spikes.

ECONOMIST: Computing

Over time, however, compassion is often blocked by negativity that develops and accumulates through the course of a life.

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In the past, U.S. sanctions have often blocked software companies from widely distributing internet-related tools in countries where access seems especially critical.

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