Another promising obesity-prevention strategy is to improve the foods that children eat at school. Because it is easier for policymakers to regulate what is
served in the school cafeteria than to affect what is offered on the kitchen table, schools are a logical place to focus efforts to improve children’s diets.
第一句：主詞、動詞
strategy, is
不定詞片語當主詞補語，邏輯上等於主詞strategy
to improve the foods that children eat at school
that children eat at school 受格關代引導的形容詞子句、後位修飾名詞foods
第二句：表示原因的副詞子句的主詞、動詞、主詞補語
it (虛主詞), is, easier
to regulate ... table 不定詞片語是具有實質內涵的主詞
兩個不定詞片語做為兩件事進行比較，對於policymakers而言，A比B容易
A: to regulate what is served in the school cafeteria
B: to affect what is offered on the kitchen table
兩個不定詞的受詞是名詞子句
A: to regulate + (what is served in the school cafeteria)
B: to affect + (what is offered on the kitchen table)
第二句：主詞、動詞、主詞補語
schools, are, place
不定詞片語to focus efforts、當形容詞、後位修飾名詞place
不定詞片語to improve children’s diets、當副詞、修飾動作improve、表示目的