顶隙；顶部空间的英文

• headspace

• 隙:    crack; chink; crevice
• 顶部:    top; upper apex; top half; h ...
• 空间:    space; enclosure; room; blan ...
• 顶部空间:    head room; head space; headroom; headspace
• 顶房，顶部空间:    head room