1. Speed is safety when skating on thin ice. -(USA) Emerson

Explain: When skating on thin ice, don't just pursue speed without paying attention to safety.

2. If you want to be safe in life, you should have five essentials. One clean air, two clear drinking water, three circulating ditches, four sweeping houses, and five sunny days. -Florence Nightingale (UK)

Explanation: To pursue safety in life, we need fresh air, clean environment, abundant sunshine and so on.

3. Life doesn't sell round-trip tickets. Once you leave, you can never return. ? -(French) romain rolland

explained: Time can't go backwards or start again, so once you act, you can't go back and forth.

4. It is unsafe and unwise to do things without conscience. -(Germany) Martin Luther

explained: You can't do things without conscience.

5. People who are friends with justice are safe everywhere. -(ancient Greece) Epicurus

explained: People with justice are safe everywhere.