In this way the little yellow flowers that form the head are kept safe and warm till finer weather comes.

样一来, 构成头状花序的黄色小花就到了保护并且能够暖, 直到天气情有所好转。

Yes, and it was quite an innovation because the arrowheads they were using before were made of dandelion heads.

是的，是一次重大的创新，因为他们之前使用的箭头是由蒲公英的头状花序制成的。

Outside the large flower-head is a double row of small green leaves, which protected the tiny flowers within when the " head" was only a bud.

巨大的头状花序外面长有两排小绿叶, 它们能够在“头状花序”只是蓓蕾时保护深藏其中的幼年小花。