对于业余博物学者来说，在一片空地上或被炸后的废墟里可能发现种类繁多的植物群和动物群。A vacant lot or a bombsite can, to the amateur naturalist, produce an extraordinary variety of flora and fauna.通过观察某些现存的动物群和植物群,我们就能更清楚地了解这种困难了.We shall appreciate this difficult...
MC 14499 was the serial display driver of BCD input and decimal output.MC14499是一种BCD码输入-十进制码输出的串行显示驱动器.Of an electronic circuit or device; having an output proportional to input; amplifying or attenuating all frequencies...
The scientific name for common salt is sodium chloride.食盐的学名是氯化钠。Common salt is made up of 40% sodium and 60% chloride.食盐由40%的钠和60%的氯化物构成。The fish or seafood is heavily salted with pure sodium chloride.鱼或海鲜被抹了厚厚的纯盐腌制起来。...