There are still 34 species of host undetermined pests needing further observation and study.

尚有34种寄主未确定的害虫，还需进一步观察和研究。

youdao

SEM is an important means for the observation and study of the artificial opal photonic crystal.

扫描电子显微镜是对人工欧泊光子晶体进行形貌观察、研究的重要手段。

youdao

This paper summarizes the results of observation and study for star formation in different phases.

综述了恒星形成各个阶段的观测结果和研究现状以及成协的天体物理环境情况。

youdao

The average 25-34-year-old consumes twice as many sandwiches every year as does a 45-54-year-old, says Raphael Berger, at the Research Centre for the Study and Observation of Living Conditions.

ECONOMIST: Faster food replaces the leisurely lunch

Instead she offers a memorable mixture of scientific study and earnest observation.

ECONOMIST: Otters in the wild: Beguiling carnivores | The

In an accompanying editorial, Dr Kenneth Vega and Dr David Johnson said the work "confirms similar observation from a study in men".

BBC: Exercise reduces gallstone risk