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1.the sum of 总和；总数
例句:The sum of all the angles of a triangle is 180 degrees.
三角形内角总和为180度。
2.drug maker 制药者
例句:The partnership includes United Nations agencies, the World Bank and leading drug makers.
这合作组织包括联合国机构，世界银行和知名制药商。
3.live up to 达到了；实践
例句:Sales have not lived up to expectations this year.
今年的销售额不尽如人意。
4.test out 彻底检查；考验
例句:I can't wait to test out that new mattress.
我已经等不及试试我们的新床垫了。
