The giant bill of the chestnut-mandibled toucan makes up a third of the bird's body length, but thanks to a honeycomb structure, it's not as heavy as it looks.

栗嘴巨嘴鸟很大的喙占据了它身体的三分之一长度，但由于其为蜂巢式结构，它并没有看起来那么重。

youdao

In the fossil record, the research team found evidence of changes in leg length and pelvic structure that may have made it easier for some chimps, like the one in their study, to stand upright.

该组研究人员通过研究化石，发现了后肢长度和骨盆结构变化的证据，这种变化可能使某些黑猩猩更容易直立行走，就像在上述实验中观察到的那只一样。

youdao

This in turn dictates the length, type, and structure of the EPC.

编码方案进而指出EPC的长度、类型和结构。

youdao

More than 700 people have walked the length of the Roman structure since the full route opened in May - the first time it has been possible for 1, 600 years.

BBC: Roman trail proves hit with tourists