unstable不稳固的；不稳定的...unsuitable不合适的，不适宜的...untie解开，松开；解放

unstemmed shot 无炮泥爆破...unsuitable 不适合的...unsupported width 无支宽度

Unstuffing Survey 拆箱检验...unsuitable 不适当的...Up to Sample 符合样品

unsatisfactory 不能令人满意的...unsuitable 不合适的不适宜的...The Earth is only one of the numerous planets. It is not unique. so one day, we had unexpected guests. Some Ets were coming. Unlike other Ets, they were unkind. They had unlimited ambition. They were unlikely to treat the earthmen well. The earth union held an urget meeting in a university. The world unity was essential in time of universal war. All the officers wore in uniforms.The chairman unlocked a door and guided the others to walk into the room. Then he unfolded a universal map. He said the earthmen must unite against the invaders. All the people that supported the chairman would be unified under his leadership. Unfortunately, the chairman was unfit for the position even though he said the people's accusation was unjust. The chairman's work was unsatisfactory. According to his order many workers were unloading weapons from ships in the harbor. All the weapons were unpaid. Nobody knew that most o f these weapons were unsuitable to cope with those Ets. the Earth was facing a catastrophe unlee some real leader replaced the chairman.