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

前者四氢大醇（THC）含量在25%以上，这种化学成分赋予了大心理效应。

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

伦敦国王学院研究显示，大二乎可以阻止四氢大影响，四氢大是大植株中精神活性成分。

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

导致奖励（高）强效精神活性大素是四氢大，我们科学家称之为四氢大。

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" .

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