Quantifier for what new moon?

According to the query Baidu question bank, I know that there is a () new moon, and fill in the quantifier. Answer: a crescent moon. A crescent moon: this quantifier describes that the shape of the crescent moon is curved and appears before the full moon. When the earth, the sun and the moon are in specific positions, only a small part of the illuminated semicircle can be seen, just like a weak and curved silver mouth.

Explanation: something used for bending: a crescent moon. "Bend" is a quantifier to express shape. Matching: a crescent moon, this crescent moon, a curved eyebrow and two curved eyebrows.