笔直走用英文怎么说

笔直走用英语叫做 "walk straight ahead"。

其中 "straight" 为形容词，意思为 "笔直的"，"ahead" 为副词，意思为 "向前"。

例句1:
"Please walk straight ahead and take the first left." (请笔直走，第一个左转。)

例句2:
"I need you to walk straight ahead and make sure you don't get lost." (我需要你笔直走，确保不会迷路。)