In the former, levels of tetrahydrocannabinol (THC), the chemical behind the psychological effects of cannabis, are above 25%.

前者的四氢大麻醇（THC）含量在25%以上，这种化学成分赋予了大麻心理效应。

Earlier research at King's College London had shown that CBD seemed to block the effects of tetrahydrocannabinol, the intoxicating substance in cannabis.

伦敦国王学院的早期研究显示，大麻二酚似乎可以阻止四氢大麻酚的影响，四氢大麻酚是大麻植株中的精神活性成分。

The potent psychoactive cannabinoid that leads to the reward -- the high -- is THC, which we scientists call tetrahydrocannabinol.

导致奖励（高）的强效精神活性大麻素是四氢大麻酚，我们科学家称之为四氢大麻酚。

Although naturally these cannabonoids circulate at much lower quantities compared to the large influx imposed by smoking, specifically the chemical tetrahydrocannabinol or THC resembles a natural transmitter called " anandamide" .

尽管与吸烟造成的大量涌入相比，这些大麻素的自然循环量要低得多，但特别是化学四氢大麻酚或 THC 类似于一种称为“anandamide”的天然递质。