Names should be formed from the 26 upper and lower case letters (A .. Z, a .. z), the 10 digits (0 .. 9), and _ (underbar).

变量名应由26个大小写字母(A..Z,a..z),10个数字(0..9),和_(下划线)组成。

youdao

Good habits should be formed from early childhood.

良好的习惯应从小养成。

youdao

It took millions of years for fossil fuel to be formed from plants.

从植物变成矿物燃料约需几百万年。

youdao

Progress in two thousand two showed that plastic made from feathers could be formed like other plastics.

VOA: special.2010.06.01

It is the first time President Yadav has urged the new government be formed under a majority banner, as opposed to one built with a full consensus from all 25 parties.

VOA: standard.2009.05.10

Under the proposed rules, a "citizens' committee" would be formed, made up of people from at least seven different member states.

BBC: Citizens' initiative debate

Though the public sector produces relatively few spin-off companies, those that emerge from hospitals and universities tend to be formed by technologists.

ECONOMIST: The north-east's propensity for high-technology

Since taking office two years ago Mr Ritter has signed legislation requiring 20% of state energy to be produced from renewable sources by 2020, and has formed a research partnership between Colorado's universities and the Department of Energy's National Renewable Energy Laboratory, west of Denver.

ECONOMIST: But Western libertarianism is no help at all