We held this lecture with an aim of drawing attention to the problem of environmental pollution.

我们举办这场讲座，是为了引起人们对环境污染问题的关注。

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For this type of problem, developers often employ defensive programming techniques that aim to catch potential errors before they wreak havoc.

对于这类问题，开发人员通常会使用防御性编程技术，该技术专门用来在发生摧毁性后果前捕捉潜在错误。

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Indeed there are several protocols available that aim to solve this problem.

目前的确有若干协议着眼于这个问题。

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But the problem in this is it looks as though they aim to try and target Oxford Circus, there'll be a lot of innocent people around.

BBC: News Online