What food there is takes the form of bits of organic debris drifting down from the sunlit surface waters, thousands of meters above.
少量的有机残片从几千米以上可以接受阳光的海面上沉入海底。
Instead, it secretes a glue and USES this to stick bits of sand together to form its casing, in the way that a freshwater caddis fly larva does.
堆沙蠕虫分泌出一种胶状物将沙石粘合在一起形成壳装,这一点类似于淡水石蛾的幼虫。
There are about 4 billion IPv4 addresses, because the length of the addresses in binary form — 32 bits — allows for that many possible unique combinations.
大约有40亿个IPv4地址,二进制的IP地址的长度是32位,可以有这么多不同的组合。
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