With increasing reaction time, the cross linking reaction proceeded from the surface to core gradually to give a gelatin material with cross-linking degree gradient across the section.

研究发现，随着交联时间的延长，交联反应从明胶材料的表面至内部逐步进行，由此可获得交联度呈梯度变化的明胶材料。

youdao

Vehicle real driving investigation comes up with time section cross method, and USES advanced instruments such as non-contacted speed sensor with tracking filter etc.

车辆行驶状况路上调查采用分时段交错法进行，并使用具有高精度的可跟踪滤波的非接触式速度传感器等先进设备采集数据。

youdao

Objective:To investigate the appearance of enamel on the cross section of tooth after etched with 37% phosphoric acid for different etching time .

目的：观察用37%磷酸凝胶以不同酸蚀时间处理后的牙釉质在牙齿横断面上的形态改变。

youdao

"It's quite a cross-section of American maritime history frozen in time on the Great Lakes.

VOA: special.2009.11.11

The Prince of Wales and the Duchess of Cornwall will spend time with athletes from a broad cross section of Commonwealth countries.

BBC: Security at Delhi 2010

If advertisers want to reach the broadest cross-section, the Super Bowl continues to deliver, big time.

FORBES: Time Shifting, Platform Shifting Changing the Face of Television