一只乌鸫飞下来，停在他窗外的矮墙上。A blackbird flew down and perched on the parapet outside his window.这只乌鸫迅速警惕地张望了一眼，以防那只猫就在附近。The blackbird had a quick, wary look in case the cat was anywhere around.北美洲乌鸫,其蓝黑色的羽毛在秋天呈现铁锈红色的边.North Ameri...
我出门上街并拉上了门。I let myself out into the street and pulled the door shut.我这人非常孤僻，从不出门。I'm very much a loner — I never go out.我走出门，竖起衣领抵御冷雾。I stepped outside and pulled up my collar against the cold mist....
...bedridden persons confined to the supine position.那些只能平躺在床上的久病不起的人。He had to spend two years bedridden with an injury.他因伤不得不卧床两年。With two children bedridden the mother was ill at ease.两个孩子病得躺在床上,母亲非常焦急.It is especiall...
Only in this way can the critical mass of participation be reached.只有这样才能凑足参与人数。Each year, hundreds of animals are killed in this way.每年都有数百只动物被这样杀掉。In this way we get better results in teaching.这样我们的教学效果就比较好了....
这种反应构成了制备芳基环丙基乙炔的有效方法.This sequence constitutes an efficient method for preparing arylcyclopropylacetylenes.通过选择性氧化,将水溶性优良的羟丙基β环糊精转化为丙酮基羟丙基β环糊精.Water soluble hydroxypropyl � � cyclodextrin was converted to acetonyl hydro...