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in case
lest
Dogs must be vaccinated against distemper.
The chops should be cooked over moderate heat to prevent excessive charring.

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Open the tool →以防 (yǐ fáng) means “to prevent, in case, lest”.
以防 is pronounced yǐ fáng in Mandarin Chinese.
“to prevent” is 以防 (yǐ fáng) in Chinese.
This page has 2 example sentences using 以防, each with pinyin and an English translation.