中軸骨

The mollusc phylum includes all soft-bodied animals without backbones. 軟體動物門包括所有無脊椎的軟體動物。

Who will win the battle for the backbones? 誰能贏得主干網(wǎng)之戰(zhàn)?

Only two backbones， a thousand ribs. 只有兩根脊椎，卻有很多肋骨。

Simply adding bandwidth to the Internet backbones is not an answer. 只是簡單的在互聯(lián)網(wǎng)骨架上增加帶寬是應(yīng)付不了的。

They are vertebrates,that is,animals that have backbones. 它們是脊椎動物，即有脊骨的動物。