With the increase of etching depth, the generated particles are difficult to escape from micro-structures, causes so that the ablation rates decreases.

随着刻蚀深度的增加，光解生成物的脱出变得困难，从而导致刻蚀速率的降低。

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It is difficult to train pigeons to escape from a certain situation by pecking.

训练鸽子通过叼啄来脱离某种情境是很困难的。

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It is difficult for them to escape from the prison.

对于他们来说，想从监狱逃走是很困难的。

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The country has found it difficult to escape from poverty, partly because of a trade blockade imposed by neighbouring Turkey and Azerbaijan since the 1990s war with Azerbaijan over Nagorno-Karabakh.

BBC: Armenia President Serge Sarkisian wins new term

This has not stopped the credit-card industry from lobbying furiously for Congress to make it more difficult for people to escape their debts by filing for bankruptcy.

ECONOMIST: Deeper in debt