"It's something of a mystery, " Lauderdale said.
劳德黛尔说：“目前，这还是个不解之谜。”At the core of solar's sorry market performance lies an enigma: solar sells, but it's tough to turn a profit.
太阳能股令人遗憾的市场表现的核心是一个不解之谜：太阳能卖得出去，但却赚不到钱。But how, exactly, exercise affects the staggeringly intricate workings of the brain at a cellular level has remained largely mysterious.
但是，运动锻炼究竟如何在细胞水平上对大脑复杂惊人的运作施加影响仍然是不解之谜。Some of the old questions, though, are still rattling around like skeletons in a cupboard.
但是，一些老问题的解释依旧犹如不解之谜般莫衷一是。The daylight trees of July are signs of common beauty, common freshness, and a mystery familiar and abiding as night and day.
七月白昼的葱都树木，体现出普通的美，常见的清新，是一种如同黑夜白昼般惯常而又永恒不变的不解之谜。Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply.
当然，避免这些医学不解之谜的一个方法是使食物供给远离危险的生物体。Stapleton, and the case has now been so entirely cleared up that I am not aware that there is anything which has remained a secret to us.
我和斯台普吞太太已经谈过两次话了，这个案件现在已经完全搞清楚了，我不知道还会有什么不解之谜。Why these three particular services deserve this special treatment is a mystery to me.
为什么这三种服务就应该受到特殊对待，对我来说还是一个不解之谜。For its bizarre variety and for its enduring mystery, we must learn to treasure the sea.
因为它的奇特多样性，也因为它的不解之谜，我们必须学会珍视海洋。