1. If they are grouped into larger units one can ascertain what group an unknown plant belongs to. 如果把它们归类成较大的单位，那么就可以确知某种未知植物属于何类群。
2. "We're working with Chinese government officials in the area to ascertain their whereabouts and welfare, " said the US official. 这位美国官员表示：“我们正与该地区的中国政府官员一道查明二人的下落和现状。”
3. The choice of ascertain rural collective proprietary right of land is establish peasant collective congress, recreate the rural collective subject of land. 落实农村土地集体所有权的选择是设立农民集体大会，重塑农村集体土地所有权主体。
英英解释
v.
1. establish after a calculation, investigation, experiment, survey, or study
2. be careful or certain to do something; make certain of something
3. find out, learn, or determine with certainty, usually by making an inquiry or other effort
4. learn or discover with certainty
