She is a long - distance runner , and she likes to run marathons.她是 长跑 选手, 喜欢跑马拉松.As a long - distance runner his main break came last spring in Australia.作为一位 长跑 选手,他是上个春天在澳大利亚真正交上好运的.She excels as a long - distance run...

The basic substance Willis selected for the strata of his experiments was beeswax.威利斯在他做的试验中选择摸拟地层基本物质是石蜡.The titanium ascorbate was the substance of low toxicity to fish, shellfishand anura.抗坏血酸钛对鱼类 、 类及无尾两栖类皆为低毒物质.musi...

distance的第三人称单数（三单）为：distances...