Add four drops of red food coloring to the water above the hot cup and four drops of blue food coloring to the water above the cold cup.

从热杯子上方向水中加四滴红色食用色素，从冷杯子上方往水中加四滴蓝色食用色素。

youdao

A sleep-promoting bath can be made from 6 drops chamomile oil, 2 drops lovage oil, and 2 drops lime flower oil, added to a warm to hot bath.[17]

促进睡眠的泡澡是由6滴甘菊油，2滴拉维纪草，和2滴酸橙花油，加入热水中。

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If you don't, a short fast will help, along with steam inhalations, which involve adding a couple of drops of tea tree oil to hot water.

如果不需要，可以尝试短期的禁食和雾化疗法。采取雾化疗法时需要在热水中加入几滴茶树油。

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Others like The Buckle, Hot Topic and Wet Seal saw drops in revenue.

FORBES

Or curl up with a hot water bottle as the temperature drops and listen to the whoop calls of hyena as you drift off to sleep.

BBC: Safari in Kenya without four wheels

After our 3.30 a.m. finish, the ensuing daylight hours started with a couple of eye drops but pretty soon, the intrepid Talk Asia team was dashing off to our next interview with Bollywood hot shot director and chat show host, Karan Johar.

CNN: In the Field