If I know more about first aid, I could help them.
如果我多知道一点急救知识，我就能帮助他们了。
Help before it's too late. Attend first aid training.
在太晚之前伸出援手。请参与急救训练。
If have had known more about first aid, I could help them.
要是我多懂得一些急救知识，我就能帮助他们了。
If have had known more about first aid, I could help them.
要是我多懂得一些急救知识，我就能帮助他们了。
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