1·A third presidential candidate emerged to mount a serious challenge and throw the campaign wide open.
第3位总统候选人上场郑重发出挑战，令这次竞选充满悬念。
—— 《柯林斯英汉双解大词典》
2·And I think this is a serious challenge.
我认为这是一个严重的挑战。
3·Mobile devices present a serious challenge.
移动设备面临巨大挑战。
4·This can make parenting a serious challenge.
这对家长来说是个很大的挑战。
5·Food prices pose a serious challenge to society at large.
全社会面临这食品价格的严峻挑战。
6·Meanwhile, the NiMH battery is facing its first serious challenge.
与此同时，NiMH电池组正面临首次严峻挑战。
7·China faces a serious challenge with the number of a (H1N1) infections.
随着甲流感染人数的上升，中国正面临着严峻的挑战。
8·This is when you can expect to face some serious challenge or opposition...
此时，你会面临严峻的挑战和阻碍。
9·"This is a very serious challenge to the way the society operates," I was told.
“这对于学会运作的方式是一个非常严重的挑战，”我被如此告知道。
10·Thismethod brings serious challenge for the security of Cryptographic Chip.
该方法的出现给密码芯片的安全带来了严重的挑战。