Capturing facial expressions and using them to drive the expression of a virtual character is more difficult than motion capture, because the movements involved are much smaller and more subtle.

捕捉面部表情，并用这些表情来操纵虚拟角色的表情，比捕捉肢体动作困难得多，因为它涉及的动作微小得多，也更加难以捉摸。

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This boom brings a problem: it is helping to drive up the Canadian dollar, which risks making life more difficult for manufacturers back east.

这种强烈需求带来一个问题：对加拿大元的升值起了推波助澜的作用，使得东部的厂商生存更加艰难。

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These words are incredibly difficult to rank for and won't drive qualified traffic to your site. Focus on words that are relevant, but not overly used.

这些词很难得到排名也不能给你带来高质量的流量，把精力集中在那些相关的，但又不是特别通用的词上。

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Oh really? I imagine that it must be very difficult to drive in a big city like New York.

是吗？在大城市开车肯定会比较困难，比如在纽约。

Do you ever实战 - SpeakingMax英语口语达人

It trains African health workers to drive safely on difficult terrain and teaches them how to carry out simple maintenance checks on their vehicles on a daily basis.

CNN: Off-road bikers race to save lives in rural Africa

As the number of different studies indicates, using data and analytics to drive business growth is difficult, but important.

FORBES: The CEO/CMO Dilemma: So Much Data, So Little Impact

However, given the presently sluggish signal from economic indicators, it might be difficult to drive expansion plans in the near term.

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