The rough waters in the trough scatter light in all directions, forming a dark line.

谷底汹涌的水体将光散射到各个方向，形成了一条暗线。

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Almost all women will notice a dark line form from their bellybutton down to their pelvis called the "linea negra."

几乎所有的女性都会看到一条从肚脐往下到骨盆位置形成了一条被称做“黑中线”的暗线。

youdao

Almost all women will notice a dark line form from their bellybutton down to their pelvis called the "linea negra."

几乎所有的女性都会看到一条从肚脐往下到骨盆位置形成了一条被称做“黑中线”的暗线。

youdao