This particular drawing is of a process called clathrin-mediated endocytosis. It's a process by which a molecule can get from the outside of the cell to the inside by getting captured in a bubble or a vesicle that then gets internalized by the cell.
この絵が示すのは クラスリン媒介エンドサイトーシス と呼ばれるもので 細胞外の分子が 泡のような被覆小胞で 細胞内に取り込まれ 細胞の一部になる過程です