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.

伦敦国王院的早期研究显示，大麻二酚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，但特别是四氢大麻酚或 THC 类于一称为“anandamide”的天然递质。