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1.The dog gave a low snarl.
这只狗发出低沉收藏指正
2.Dogs usually use high-pitched single barks when they are separated from their owners and a lower, harsher superbark when strangers approach or the doorbell rings, according to Sophia Yin, an animal behaviorist at the university.
该大学动物行为主义学者苏菲·尹认为,当小狗和主人分离时候,通常它们会更加尖锐;反之,一旦发现有陌生人接近或者门铃响起时,它们则会警觉地发出异乎寻常低沉而又刺耳。收藏指正
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