I attempted to mask my ignorance by keeping my head down and not speaking unless spoken to.

我试图掩盖自己的无知，每天低着头干活，除非别人跟我说话，否则不主动交谈。

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The child may respond to a teacher's request for quiet or control by looking away, putting his or her head down on the desk, orsimply ignoring the teacher.

孩子可能以冷漠和撇过去不看他们作为对老师要求的回应，低头对着桌子，直接无视老师的存在。

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When the head begins to heat up, yawning acts as a natural "thermostat" by allowing cool air to rush in and bring the brain back down to a healthy temperature, research suggests.

科学家研究发现，当人的大脑开始出现过热时，打呵欠的动作就充当天然的“自动调温器”，让清凉的空气进入大脑，使大脑温度恢复到健康水平。

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The Lions were already two casualties down by then, tight-head Murray departing with an ankle injury after just seven minutes and Hook following five minutes later after a lengthy period of treatment for a neck problem.

BBC: Southern Kings 8-20 Lions

Are you required to help them do so by keeping your head down, doing your work well and not taking risks?

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And so, to play Larry, skilled clown Sean Hayes ("Will and Grace") transforms himself by shaving his head down the middle, letting prickly tufts of Larry-like hair protrude on the sides.

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