Objective To study on changes regulation of ALP and PALP in urine of the pregnant women during various gestational peiods.

目的观察孕尿碱性磷酸酶（ALP）及其胎盘型同工酶（PALP）随孕周的变化规律。

youdao

This week, we will tell about a study linking activity on the sun to changes in Earth's climate.

VOA: special.2009.09.29

Dinaburg said he became interested in this topic last year at Black Hat when a friend, Robert Edmonds, and Paul Vixie presented on a study of changes observed within the domain name system (DNS).

FORBES: Bitsquatting: Machine-Garbled Internet Connections

As a rule, it's better to hire people who've done something similar before, Khurana says, basing his conclusion on a study of 1, 300 management changes over 17 years.

FORBES: Magazine Article

But the government said the report had been based on a National Audit Office study which focused on "very early days" in the service, since when significant changes and a "marked improvement" had been made.

BBC: Prison education scheme 'failed'