HSK 7-9
风雨无阻
fēngyǔ-wúzǔregardless of weather conditions; rain, hail or shine
邮递员每天风雨无阻按时送信。
Yóu dì yuán měi tiān fēng yǔ wú zǔ àn shí sòng xìn.
The postal worker delivers the mail on time every day regardless of the weather.
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Appears across levels (7-9) in the HSK 3.0 word list.