He altered his face all at once.
他突然变了脸。
He altered his face all at once.
他突然变了脸。
All at once it began to rain.
突然间下起雨来。
Add buttermilk all at once and mix just to combine. Do not overmix, or the scones will be tough.
马上倒入白脱牛奶，拌匀即可，不要过度搅拌，否则会令司康
饼变硬。
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