天气逐渐变冷。

Tiānqì zhújiàn biàn lěng.

The weather is gradually getting colder.

天气开始逐渐变暖。

Tiānqì kāishǐ zhújiàn biànnuǎn.

The weather is gradually getting warmer.

孩子们的表现逐渐好转。

Háizimen de biǎoxiàn zhújiàn hǎozhuǎn.

The children's performance is gradually improving.