He said the past two years have been extremely challenging for China.
他说，过去两年对中国来说是极其困难。
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。
Testing is an extremely creative and intellectually challenging task.
测试是一个极富有创造力和聪明才智的挑战性的任务。
The question proved to be extremely difficulty, challenging and even controversial.
这一问题颇具难度、挑战性和争议性。
The question proved to be extremely difficulty, challenging and even controversial.
这一问题颇具难度、挑战性和争议性。
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