They froze Earth deliberately to assure that such toxins would release slowly. 他们故意冻结了地球来保证这些毒素可以缓慢释放。
These stents slowly release a medication that preents the build-up of scar tissue, which can result in reclosing of arteries. 瘢痕组织增生能够导致动脉再闭合,而上述支架能够缓慢释放一种药物阻止瘢痕增生,进而达到预防动脉再闭合的目的。