求翻译：假如我是志愿者。我会无偿献血。在公交车上，看到老人有座让座，无座招呼他人让座。用自己所学帮助别人。是什么意思？

If I were volunteers. I will be free blood donation. In the bus, saw the old seat with seat, no seat call another seat. Learned to help others with their own.

If I were volunteers. I will be free blood donations. In public transportation vehicles, and saw the old man with a block, block to block, there is no salutation, let block, others. their own school to help others.

If I am a volunteer.I can donate blood without compensation.On the public transportation, saw the old person has the place to offer one's seat to somebody, the non-place greets other people to offer one's seat to somebody.Studies help others with oneself.

If I was a volunteer. I will volunteer blood donors. On the bus, see old man has a seat without greeting others seats. With their knowledge to help others.

If I am a volunteer. I know the unpaid blood donation. On the bus, sees old man has one to offer one's seat, there is not one that greet others and offer one's seat. By learning to help others by oneself.