主成分分析中，各主成分的方差逐渐减少。 

Salisbury sent him on a diplomatic（） to North America.

未知题型Salisbury sent him on a diplomatic（） to North America.

Experts are trying to（） ways to clean up the huge slick...

未知题型Experts are trying to（） ways to clean up the huge slick.

They have（） a number of conditions to the agreement.

未知题型They have（） a number of conditions to the agreement.