这条线必须与地面保持垂直,否则测量结果会出现偏差。Zhè tiáo xiàn bìxū yǔ dìmiàn bǎochí chuízhí, fǒuzé cèliáng jiéguǒ huì chūxiàn piānchā.This line must remain vertical to the ground; otherwise, the measurement results will deviate.
旗杆笔直地插在地上,和地面垂直。Qígān bǐzhí de chā zài dìshàng, hé dìmiàn chuízhí.The flagpole stands straight in the ground, perpendicular to the surface.
火箭几乎垂直地冲向天空。Huǒjiàn jīhū chuízhí de chōng xiàng tiānkōng.The rocket shot almost vertically into the sky.