mammotropin

例句：

1. 1. Mammoths are the largest land mammals in the world.
   猛犸象是世界上体型最大的陆地哺乳动物。
2. 2. The woman was given a shot of prolactin to stimulate her milk production.
   这名妇女被注射了催乳素，以刺激她的乳汁分泌。
3. 3. Prolactin is an important hormone that regulates lactation in mammals.
   催乳素是一种重要的激素，调节哺乳动物的乳腺发育。