为了给鱼塘补水，爷爷检查好抽水泵的电线，确认安全后才插上电源。
To replenish the fish pond, Grandpa checked the water pump's wiring and only plugged it in after making sure it was safe.
To replenish the fish pond, Grandpa checked the water pump's wiring and only plugged it in after making sure it was safe.