We were having a picnic, when suddenly there came a downpour wasa fly in the ointment.
當(dāng)我們正在舉行野餐的時(shí)候, 忽然大雨傾盆,未免大煞風(fēng)景.
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A was dark but had a large opening , whereas B wasa small opening.
洞穴比較黑但是有較大的開口, 而B則相反.
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