如果使用得当，避孕套是很有效的避孕手段。Condoms are an effective method of birth control if used with care.服务项目包括避孕建议和健康检查，并且免费提供。The service covers contraceptive advice and health checks, and is available free.服用避孕药是最有效的避孕方法。The pill is th...
堆土机很快把工地整平了.The bulldozers quickly leveled off the site.他们迅速地把工地整平了.They quickly leveled off the site.主要产品有轻型压路机 、 混凝土整平机 、 工程照明车等.The main products are light roller, concrete leveling machine, engineering, light trucks....