Black dots show where dead zones have been observed, but their size is unknown.
黑点代表那些已经观测到的但面积还未确定的死亡区域。
The separators were taken from an old dead automotive battery and cut to size.
该分离器是由一所旧死汽车电池和切成一定尺寸。
The separators were taken from an old dead automotive battery and cut to size.
该分离器是由一所旧死汽车电池和切成一定尺寸。
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