They thought they were actually seeing like a big canvas spread over the sky.
他们以为自己看到的，是一块覆盖整个天空的大帆布。
White glue has to be spread all over the upper canvas part, but very thinly.
先把白胶涂到上半部分的伞布上，要稀疏一点。
White glue has to be spread all over the upper canvas part, but very thinly.
先把白胶涂到上半部分的伞布上，要稀疏一点。
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