美国民兵科技 不能 按照时间条件 显示

求组，我在制作美国民兵科技时，不能按照隐藏物件 的存活时间 重新显示 民兵科技按钮

	<Tech name ='MODUSLevy' type ='Normal'>
		<DBID>5451</DBID>
		<DisplayNameID>80381</DisplayNameID>
		<Cost resourcetype ='Food'>150.0000</Cost>
		<Cost resourcetype ='Gold'>150.0000</Cost>
		<ResearchPoints>1.0000</ResearchPoints>
		<Status>UNOBTAINABLE</Status>
		<Icon>ui\techs\levy\levy</Icon>
		<RolloverTextID>80380</RolloverTextID>
		<Flag>YPInfiniteTech</Flag>
		<Effects>
			<Effect type ='Data' amount ='2.00' subtype ='FreeHomeCityUnit' unittype ='USMinutemanTechResearchPoints' relativity ='Absolute'>
				<Target type ='Player'></Target></Effect>
			<Effect type ='Data' amount ='6.00' subtype ='FreeHomeCityUnit' unittype ='Minuteman' relativity ='Absolute'>
				<Target type ='Player'></Target></Effect>
			<Effect all ='true' type ='TextOutput'>28207</Effect>
			<Effect type ='TechStatus' status ='unobtainable'>MODUSLevy</Effect></Effects>
	</Tech>

	<Tech name="LoopSentUnit" type="Normal">
		<DBID>5700</DBID>
		<ResearchPoints>0.0000</ResearchPoints>
		<Status>OBTAINABLE</Status>
		<Flag>Volatile</Flag>
		<Flag>YPInfiniteTech</Flag>
		<Prereqs>
			<Typecount unit='USMinutemanTechResearchPoints' count='1.00' state='noneState aliveState' operator='lt'/><!--当设定的单位 存活数量<1 时才会显示本科技-->
		</Prereqs>
		<Effects>
			<Effect type ='TechStatus' status ='unobtainable'>LoopSentUnit</Effect>
			<Effect type ='TechStatus' status ='obtainable'>MODUSLevy</Effect>
		</Effects>
	</Tech>

	<Unit id ='1531' name ='USMinutemanTechResearchPoints'>
		<DBID>2210</DBID>
		<ObstructionRadiusX>0.1000</ObstructionRadiusX>
		<ObstructionRadiusZ>0.1000</ObstructionRadiusZ>
		<MaxVelocity>0.0000</MaxVelocity>
		<MovementType>air</MovementType>
		<Lifespan>160.0000</Lifespan>
		<LOS>0.0000</LOS>
		<Decay delay ='0.0000' duration ='0.0000'></Decay>
		<Flag>DoNotCreateUnitGroupAutomatically</Flag>
		<Flag>NoBloodOnDeath</Flag>
		<Flag>NoUnitAI</Flag>
		<Flag>NoHPBar</Flag>
		<Flag>NonAutoFormedUnit</Flag>
		<Flag>NotSearchable</Flag>
		<Flag>NonCollideable</Flag>
		<Flag>DoNotShowOnMiniMap</Flag>
		<Flag>Immoveable</Flag>
		<Flag>Invulnerable</Flag>
		<Flag>InvulnerableIfGaia</Flag>
	</Unit>

试了几个方法都没有成功。教程是运送 单位， 我试了完全复制教程的内容：无限循环运送单位科技2，只把送单位改成 获得民兵科技。还是没有成功，使用后出现两次连续可以点的科技，然后就没有然后了。求助