只有厚厚的墙。
只有那堵厚厚的墙。
Being protected by a thick wall, they felt quite safe.
有一堵厚墙掩护，他们感到很安全。
Being protected by a thick wall, they felt they were safe.
有一堵厚墙掩护着，他们感到很安全。
Being protected by a thick wall, they felt they were very safe.
由于有一堵墙掩护着，他们感到很安全。
Being protected by a thick wall, they felt they were quite safe.
有一堵厚墙掩护着，他们感到很安全。
Being protected by a thick wall, they felt they were quite safe.
有一堵厚墙掩护着，他们感到很安全。
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