例句與造句

1. redroot pigweed ( amaranthus retroflexus l . ) is an annual species of weeds which is widely distributed and important in cultivated field and other land all over the world
   摘要反枝莧是世界性分布的一種惡性雜草，?解其生物學(xué)特性將有助于對(duì)其進(jìn)行有效防治。
2. It's difficult to find retroflexus in a sentence. 用retroflexus造句挺難的