许多人认为奥巴马的增兵计划虽然痛苦，但却必要。
Many view Mr Obama's plan to send more American forces there as a necessary evil.
尤其是如果公民觉得可以参与其中，那么做出困难但却必要的决定会容易一些。
In particular, tough but necessary economic decisions are easier to sell if citizens feel they have had some say in them.
旅游保险费用看起来似乎是没必要的，但却是必不可少的开支。
Taking out travel insurance may seem an unnecessary expense, but it is a must.
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