And more of the Wells that actually find oil are in extremely challenging geologies.
更多能够出油的井要在地质条件特别恶劣的地方才打得出来。
Overcoming depression is extremely challenging and not something that happens overnight.
克服抑郁是一个巨大的挑战而且不是一朝一夕能解决的。
Overcoming depression is extremely challenging and not something that happens overnight.
克服抑郁是一个巨大的挑战而且不是一朝一夕能解决的。
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