他们生活在不稳定的平衡中，并且这是地球上最艰苦的环境之一。
They live in precarious balance and one of the toughest environments on earth.
他们仅靠胡乱向后倾或向前倾来保持不稳定的平衡。
They maintain a precarious balance only by careening wildly back and forth.
实际上，这两种对立的感情经常处于一种微妙但又不稳定的平衡之中。
Actually, these two opposing sentiments are often in a delicate and unstable balance.
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