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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Sensitivity is often blocked by circumstantial pressure or clouds making it difficult for them to express emotionally at the right time.

周遭环境的压力经常会引起多愁善感，但阴郁也会令他们很难在恰当的时候表达情感。

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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.

FORBES: Compassion: The Bedrock Of Our Capacity To Serve

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

FORBES: Learning About Internet Freedom from Despots and Drug Dealers