without strain

• 自然地

without strain的用法和样例：

例句

1. Marian said she always sang naturally, without any thought of how she did it.
   玛丽安说她向来很自然地演唱，没有想如何去唱的问题。
2. He lifted up the rock without effort.
   他毫不费力地举起石头。
3. I can wrap up 10 tricks without lifting an eyebrow.
   我可以毫不费力地囊括十墩牌。