典型的埋伏型猎食者，它们将身子缩在森里底层或落叶层里只露出头部。

Typical ambush predators, they squeeze their bodies into the forest substrate or leaf litter so only their heads protrude.

youdao

传输层协议，诸如传输控制协议（TCP），用户数据报协议（UDP）， 会在它们的头部指定一个资源和目的地的端口号。

Transport Layer protocols, such as the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), specify a source and destination port number in their packet headers.

youdao

选择层，头部区域和高亮，按V键切换到移动工具。

Select layers, header and highlight and press "v" to switch to Move Tool.

youdao