More than once, he had cleared his throat, and drawn in the long, deep, and tremulous breath, which, when sent forth again, would come burdened with the black secret of his soul.
他不止一次清好喉咙，颤抖着深吸一口长气，准备在再度吐气的同时，把他灵魂深处的阴暗秘密装上，一吐为快。
The black market trade in exotic carnivorous plants is so vigorous now that botanists are keeping the location of some rare species a secret.
现在，外来食肉植物的黑市交易非常活跃，以至于植物学家一直对某些稀有物种的位置三缄其口。
Who knows the secret of the black box?
黑匣子之秘密，谁人知晓？
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