1,no matter which door you will be engaged in natural science research,the basic knowledge about chemicals are very necessary.
2,the natural sciences constitute a major category of systematic knowledge systems.
3,the accident occurred purely coincidental.
4,despite repeated assurances economists international trade will promote economic development in each country or pay more attention to employment and income issues.
5,a number of countries is inevitable that the interests of other countries with interests in the conflict.
6,as part of the ecological environment,the human damage to the natural environment would result in the destruction of their own. 1,no matter which door you will be engaged in natural science research,the basic knowledge about chemicals are very necessary.
2,the natural sciences constitute a major category of systematic knowledge systems.
3,the accident occurred purely coincidental.
4,despite repeated assurances economists international trade will promote economic development in each country or pay more attention to employment and income issues.
5,a number of countries is inevitable that the interests of other countries with interests in the conflict.
6,as part of the ecological environment,the human damage to the natural environment would result in the destruction of their own.