季节性

老爷爷患有多年季节性慢性哮喘病，深秋天气骤冷时很容易发作，出门必须格外注意保暖。

lǎo yé yé huàn yǒu duō nián jì jié xìng màn xìng xiāo chuǎn bìng, shēn qiū tiān qì zhòu lěng shí hěn róng yì fā zuò, chū mén bì xū gé wài zhù yì bǎo nuǎn.

My grandfather has been suffering from seasonal chronic asthma for many years. It is easy to have an attack when the weather suddenly gets cold in late autumn. He must pay special attention to keep warm when going out.

水利部大力推进农村饮水安全巩固提升工程，全面改造老旧自来水输配管网，彻底攻克了西部干旱山区上千万乡亲季节性饮水难关。

shuǐ lì bù dà lì tuī jìn nóng cūn yǐn shuǐ ān quán gǒng gù tí shēng gōng chéng, quán miàn gǎi zào lǎo jiù zì lái shuǐ shū pèi guǎn wǎng, chè dǐ gōng kè le xī bù gān hàn shān qū shàng qiān wàn xiāng qīn jì jié xìng yǐn shuǐ nán guān.

The Ministry of Water Resources has vigorously promoted the project to consolidate and improve rural drinking water safety, comprehensively renovated the old water transmission and distribution network, and completely overcome the seasonal drinking water difficulties of tens of millions of villagers in the arid mountainous areas of the west.