脆弱人群适当营养过少的复杂挑战；
the complex challenge of too little of the right nutrition for vulnerable populations;
困难情况指的是特别脆弱人群所面临的境况，例如。
Difficult circumstances refer to situations faced by particularly vulnerable groups such as.
世卫组织有对包括最脆弱人群在内的需求最大者作出承诺的悠久历史。
WHO has a long history of commitment to those in greatest need, including the most vulnerable groups.
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