美['æktənɔɪd] 1 . Starfish are actinoid -- that is, they are radially symmetrical.
海星呈放射性形状 —— 那就是说, 它们是呈对称的放射状.
来自互联网
1.any of a series of radioactive elements with atomic numbers 89 through 103
2.having a radial form;
starfish are actinoid--that is, they are radially symmetrical
