一块木板的两个侧边全没有锯或锯部分没有达到材长的二分之一强，称。

• UNAM
• unambiguous
• unanimity
• unappealing
• unapproachable
• unasked
• unattractive
• unavailable
• unavoidable
• unaware
• unbar
• unbeatable
• unbeaten
• unbecoming
• unbeknown
• unbeliever
• unbending
• unbleached
• unblemished
• unbolt
• unbowed
• unbridgeable
• unbridled
• unbroken
• Unbuffered Memory