One cause is taking too much of a phosphate-based laxative either orally or rectally as an enema.

原因之一是口服或直肠灌肠时服用过多的磷酸盐类泻药。

The slowest method is to take a drug orally because it must be absorbed by our digestive system before it takes effect.

最慢的方法是口服药物，因为它必须被我们的消化系统吸收才能发挥作用。

Taken orally its LD50 is about 20 milligrams per kilogram of bodyweight, about 8 castor beans worth of the poison, but if it's injected, like the way Markov got it, it's just 1 tiny microgram per kilogram.

口服时，LD50 约 20mg/kg，约 8 颗蓖麻子所含的量。若注入体内，像可怜的 Markov，LD50 只需约 1µg/kg，是前一剂量的两万分之一。