像所有的链条一样，冷藏链是其最脆弱的一环。
Like any chain, a cold chain is only as strong as its weakest link.
制作链锯确实无需高深科技，只是用传统的螺丝螺母将塑料手柄和金属链条加以组合。
There is no particularly special technology needed to make a chainsaw. It's really just plastic and metal parts screwed together with old-fashioned nuts and bolts.
链条驱动机构包括一条双排辊链，通过它来驱动进气和排气凸轮轴。
The chain drive consists of a duplex roller chain which drives both intake and exhaust camshafts.
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