人们的需要和他们的渴求可能非常不同。
What people need and what they want may be very different.
The hepatitis C virus was a hidden enemy, but every hidden enemy can be found with the right tools and determination.
我不怕失败,最怕的是没试过。
我们必须在能源安全的需求和减少排放的紧迫性之间取得平衡。