这段英文披露了具体过程

These green tomatoes are taken back to a warehouse, packed in boxes, which are stacked on pallets and moved into storage areas where they're exposed to ethylene （中文叫乙烯利） gas. The gas forces the tomatoes to turn the right color; it doesn't ripen them.

所有跟帖： 

• 有的时候现代科学技术起的作用很坏！ -dudaan- ♂ (0 bytes) () 05/08/2014 postreply 06:58:09

• 这是商业竞争，商家努力降低成本造成的。 -TBz- ♂ (379 bytes) () 05/08/2014 postreply 09:17:55