If this load centroid is behind the elastic axis of the wing structure, then a nose-down twist of the main wing surface results . 如果该载荷重心在机翼结构弹性轴之后，则引起主机翼表面前端向下的扭转。
He is behind the other boys in his class in school 在班级里他比别的男孩子都差。
Do you really understand what is behind the word family 你真的了解家庭的涵义吗
A : sure . i don ' t want to be behind the times （当然。我不想让自己落后于时代。 ）
Generally , boys are behind girls in spelling 一般来说男孩子的拼写不如女孩子。
What is behind your back ? . something for me ? 你背后是什么？给我的什么东西？
Sure . i don ' t want to be behind the times （当然。我不想让自己落后于时代。 ）
They are behind us in technological development 他们在科技开发方面落后我们。
You should move ahead ; the past is behind you （你应该走向未来，忘掉过去。 ）
They are behind us in education and science 他们在教育与科学方面落后于我们。
