without strain

例句：

1. 1.We need to work without strain to achieve our goals.
   我们需要努力工作，不紧张地实现我们的目标。
2. 2. She was so nervous that she couldn't speak without straining her voice.
   她非常紧张，说话时声音都有些吃力。
3. 3. The marathon runner had to run without strain, as he was exhausted from the previous race.
   马拉松跑者不得不以不紧张的状态跑步，因为他之前的比赛已经让他筋疲力尽了。