• 1. donating blood unpaid: 无偿献血
• 2. Donating blood without payment: 无偿献血

• 1.Donating blood is not difficult.
  献血并不难。
  dict.yoduao.com
• 2.Donating blood is not only one of the easiest ways to save lives.
  献血不仅仅是拯救生命最简单的方法之一。
  dict.yoduao.com
• 3.Donating blood is not only one of the easiest ways to save lives, but also a meaningful act to help others.
  献血不仅仅是拯救生命最简单的方法之一，也是帮助他人的有意义行为。
  dict.yoduao.com

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