safe的副词safely；
例句
We can build up the speed gradually and safely.
我们可以逐步安全地加快速度。
I was thankful to see theyd all arrived safely.
看到他们都平安到达，我感到欣慰。
They all arrived safely.
他们都平安抵达了。
The plane landed safely.
飞机安全着陆了。
Go to work happily and go home safely.
高高兴兴上班去，平平安安回家来。
