there must be obtained
必须要有
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But, there are certain basic ideas that must be used in every program if maximum results are to be obtained.
但是要想获得最佳效果，在每个安全措施中，都要遵循某些基本的观念。
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Fourth, there must be domestic support in the United States, which is usually obtained by congressional backing.
第四，美国需在国内获得支持，而这通常就需要获得国会支持。
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