Wasa

We were having a picnic, when suddenly there came a downpour wasa fly in the ointment.

当我们正在举行野餐的时候, 忽然大雨倾盆,未免大煞风景.

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A was dark but had a large opening , whereas B wasa small opening.

洞穴比较黑但是有较大的开口, 而B则相反.

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