当令

xiàn zài shì fú tiān xī guā zhèng shì dāng lìng de shuǐ guǒ

现在是伏天，西瓜正是当令的水果。

During these dog days, watermelons are in season.

dāng lìng de shū cài

当令的蔬菜

vegetables in season

bù dāng lìng

不当令

be out of season

cǎo méi dāng lìng shí pián yi xiē

草莓当令时便宜些。

Strawberries are cheaper when they're in season.