cop a tube的用法和樣例：
例句
用作及物動詞 (vt.)
- The milk is believed to be squirted into the calf's mouth via a tube formed by the calf's tongue and the mother's nipple.
我們認為乳汁是透過海豚寶寶的舌頭與母親乳頭所形成的管狀縫隙射入寶寶口中。 - The model hypothesizes, for example, that a simple tubular feather preceded the evolution of barbs because barbs are created by the differentiation of the tube into barb ridges.
比如，我們的模型假設，簡單的管狀羽毛先於羽枝的演化，因為羽枝是由管子分化出羽枝脊才產生的。
