Historically women chose manly men because features such as a square jaw, low brow and thin lips were linked to superior genes which would produce stronger and healthier offspring.
As shown by the experiments, the jaw grinders cast with air-quenched-bainite steel offer a life span twice as long as those made of ordinary low alloy steel.
经现场试验表明，用空淬贝氏体钢浇注的颚板，其寿命是普通低合金钢颚板的两倍。
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This means that the light is too high or low, and is likely causing shadows underneath the eyes or a lack of shadow definition along the jaw line, respectively.