20世纪70年代初，40%的孩子步行上学，而在2010年，这一比例降至15%。

In the early 1970s, 40 percent of children walked to school, while in 2010, it was as low as 15 percent.

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然而，孩子们远远地看见三个仆人来了，厨子步履蹒跚地跟在他们后面。

The children, however, saw from afar that the three servants were coming, and the cook waddling after them.

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这个步骤包括以下子步骤。

This step involves completing the following substeps.

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