The only sound was the soft tick of the clock.

唯一的响声是钟表轻轻的滴答声。

《牛津词典》

Sound, light, smell, the beds too soft or too hard, too high or too low indoor temperature, mosquitoes, flies or tick bites, etc., will interfere with sleep.

声音、光线、气味，床铺太软或太硬，室内温度太高或太低，蚊、蝇或虱的叮咬等，都会干扰睡眠。

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