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

前者四氢醇（THC）含量在25%以上，这种化学成分赋予了理效应。

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

伦敦国王学院早期研究显示，二酚乎可以阻止四氢酚影响，四氢酚是植株中活性成分。

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

导致奖励（高）强效活性素是四氢酚，我们科学家称之为四氢酚。

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" .

尽管与吸烟造成量涌入相比，这些素自然循环量要低得多，但特别是化学四氢酚或 THC 类于一种称为“anandamide”天然递质。