这种稀有而昂贵的食品实际上就是由燕子搭建鸟巢时分泌出的晶状唾液制成的。
This rare and expensive food is actually made from the jellylike saliva that swifts (a type of bird) secrete as they line their nests.
其核心部件是由金属铈制成，这种金属与铜一样储量广泛，而不像其它通常被用作催化剂的金属那样稀有和昂贵，例如铂。
The key component is made from the metal cerium, which is almost as abundant as copper, unlike other rare and expensive metals frequently used as catalysts, such as platinum.
这种稀有而昂贵的食品实际上就是由燕子搭建鸟巢时分泌出的晶状唾液制成的。
This rare and expensive food is actually made from the jelly like saliva that swifts (a type of bird) secrete as they line their nests.
这种稀有而昂贵的食品实际上就是由燕子搭建鸟巢时分泌出的晶状唾液制成的。
This rare and expensive food is actually made from the jelly like saliva that swifts (a type of bird) secrete as they line their nests.
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