暴风雨临近时，天色逐渐变暗。
The sky was gradually darkening as the storm approached.
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gradually英 /ˈɡrædʒuəli/|美 /ˈɡrædʒuəli/
darkening英 /ˈdɑːkənɪŋ/|美 /ˈdɑrkənɪŋ/
解释
程度/时间副词 gradually 在 was 与 darkening 之间，表示渐进变化的过程，属于过程副词的中位用法。
The sky was gradually darkening as the storm approached.
程度/时间副词 gradually 在 was 与 darkening 之间，表示渐进变化的过程，属于过程副词的中位用法。