科学家正在研究大麻素如何影响人体的内源性大麻素系统。

Scientists are studying how ___cannabinoids affect the body's endocannabinoid system.

这些研究中的合成大麻素被用来测试其对神经系统的潜在影响。

The synthetic ___cannabinoids in this study are being used to test their potential effects on the nervous system.

人体内的内源性大麻素有助于调节疼痛感知。

The body's natural ___cannabinoids help regulate pain perception.