The south of the country was worst _______ by the drought (干旱).
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One day ______realitywillgreatly changethe entertainment industry.
Both countries will _______ their military forces from the region.
He is now fighting his _______ to alcohol.
虚功原理有两种不同的形式,即_________原理和__________原理。其中,用于求位移的是__________原理。