王教授说近视的原因很复杂,现在仍然没有治疗方法。challenge n.挑战;vt.向……挑战
face a/the challenge面对挑战
accept/take up a/the challenge to sth.接受……的挑战
challenge sb.(to do sth.)向某人挑战(做某事)
Keeping prices from going up too sharply is a challenge to China as well as the whole world.
抑制物价迅猛增长既是中国也是全世界的挑战。instruct vt.命令;指示;教导
instruct sb.to do sth.命令某人做某事
instruct that...命令/指示……(从句用虚拟语气,即从句谓语形式为“should+动词原形”,should可以省略)
The judge instructed that the witness (should) tell the truth.
法官命令证人说实话。link n.,vt.& vi.连接;联系
link...to/with...将……和……联系或连接起来
There is a link between...and...……之间有联系
It is obvious that there is a direct link between the disease and diet.
显而易见这种疾病和饮食之间有直接的联系。
【写作素材】
1.西蒙因为接触了致命的病毒而患了重病。
2.专家和医生经过各种尝试给他治疗。
3.医生宣布病毒被打败了。
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