Condoms are an effective method of birth control if used with care.如果使用得当，避孕套是很有效的避孕手段。Although most condoms contain spermicide, there are some manufactured without.虽然多数避孕套含有杀精剂，但也有一些是不含的。Abstain from sex or use condoms....
A method of estimating Direction Arrival ( DOA ) based on Multistage Weiner Filtering ( MSWF ) is proposed.提出一种基于多级维纳滤波器 ( MSWF ) 的信号波达方向 ( DOA ) 估计算法....
In her dying days the old Queen unbent a little.在临死的那些日子里，年迈的女王态度稍缓和了一些。At the party even the professors unbent and told jokes.在晚会上,连教授们也变得轻松随和,讲些笑话.Trees with straight unbent trunks make the best lumber.树干笔直的树木是最好的木材材料....
血浆蛋白的白蛋白部分意义最大.The albumin fraction of plasma protein is of the greatest significance.白蛋白细胞的功能尚不清楚.The function of the albumen cells is not known.同时白蛋白和甲胎蛋白的合成被熄灭.At the same time that albumin and fetoprotein synthesis i...