Parallel lines will never meet no matter how far extended.无论延伸多长，平行线永不相交。Loans were extended to help pay the interest on the old ones.这些贷款延期偿还以支付旧账利息。The training covers extended periods in obstetrics and gynaecology.该培训...
盼望有一天有人会研制出一种能有效预防疟疾的疫苗。Roll on the day someone develops an effective vaccine against malaria.抗疟疾的疫苗正在试验阶段。Anti-malarial vaccines are now under-going trials.下周，卫生部长们将在阿姆斯特丹聚首共商防治疟疾的策略。Next week, health ministers gather i...