��翻倍
	</div>
</span>
<span id="flashcard_leit_b_front">
	<div id="fc_words" class="fcard_center" style="height:4.5em">
	Leitner盒的游戏：
	<br>
	当你答<i>对</i> 了一张卡片，你就把它移动<span class="underline">______</span> .
	</div>
</span>
<span id="flashcard_leit_b_back">
	<div class="fcard_bg" src="pics/fcards_ch2.png" sx=0 sy=480></div>
	<div id="fc_words" class="fcard_center" style="height:170px">
	到上面一个等级
	</div>
</span>
<span id="flashcard_leit_c_front">
	<div i