变幻莫测的灰色和坚定不变的红色，这两道光芒控制住了河鼠，使他处于动弹不得，痴痴迷迷，又无能为力的状态。
The twin lights, the shifting grey and the steadfast red, mastered the Water Rat and held him bound, fascinated, powerless.
禽流感不应使我们感到无能为力。
亲爱的范妮，他倒没有规定具体数目，只是笼统地要求我帮助她们，使她们的境况好一些，他是无能为力啦。
He did not stipulate for any particular sum, my dear Fanny; he only requested me, in general terms, to assist them, and make their situation more comfortable than it was in his power to do.
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