在邮件中使用 'I'm' 这样的缩略形式会让语气更轻松。

Using ___contractions like 'I'm' in emails makes the tone more casual.

助产士告诉她深呼吸可以帮助缓解宫缩的疼痛。

The midwife told her that deep breathing could help ease the pain of ___contractions.

金属在寒冷天气中收缩会使桥梁变短。

The ___contraction of metal in cold weather makes bridges shorter.