I don’t like to do easy things. I like to do things that are challenging and that push me.
當(dāng)我們無力改變處境時(shí)，我們就被挑戰(zhàn)去改變自己。
In the realm of quantum mechanics, the observer and the observed are inextricably linked, challenging our classical notions of reality.
The challenges of today's coal industry require bold leadership and vision.