But now we know what makes flu such an annual irritant , and so potentially deadly , is that like the hiv virus that causes aids , it is a moving target 不过我们现在知道流感之所以年年来袭且其潜在致命性如此高，就是因为它跟引发爱滋病的人体免疫缺乏病毒（ hiv ）一样，都是游移不定的射击目标。
Once a mere irritant , the softwood - lumber dispute is rapidly becoming a perilous symbol of u . s . indifference to its treaty obligations ? ? and its trading partners 加拿大和美国的软木材纠纷当初只是一种让加拿大气愤的事，但是现在，这一纠纷正迅速成为美国在贸易协议问题上对贸易合伙人背信弃义的危险象征。
Intrinsic asthma : asthmatic attacks are precipitated by respiratory infections , exposure to cold , exercise , stress , inhaled irritants , and drugs such as aspirin . adults are most often affected 内源性哮喘:哮喘发作与呼吸道感染有关，暴露于严寒，锻练，压力，吸入刺激物，药(如阿斯皮林) 。成年人最常受其影响。
It is formed when an irritant gets inside of a shell and the shell protects itself by coating the irritant with the same material of its lining . in essence it is formed in the same way pearls are formed 在菲律宾，常见的珍珠母工艺品是茶杯垫，一般用从珍珠贝壳内侧剥离出来的珍珠母贴在金属基板上，然后用一条很窄的金属薄片镶边。
It is formed when an irritant gets inside of a shell and the shell protects itself by coating the irritant with the same material of its lining . in essence it is formed in the same way pearls are formed 在菲律宾，常见的珍珠母工艺品是茶杯垫，一般用从珍珠贝壳内侧剥离出来的珍珠母贴在金属基板上，然后用一条很窄的金属薄片镶边。
An anti - irritant , has a depigmenting effect as well as an inhibitory effect on melanin synthesis due to its ability to act as a tyrosinase inhibitor . origin : egypt . suggested usage : 5 % - 10 % 美白、减少黑色素形成；杀菌、消炎、增强皮肤免疫力；修复细胞并皮肤所受到的刺激，舒缓敏感皮肤；抗氧化；同时具有吸收紫外线、抑制酪胺酸?作用。产地：埃及。建议使用量： 5 % - 10 % 。
Maleic anhydride is a white needle - like , briquette or flaky crystalline with irritant odour and sour , inflammable and sublimating . it can be freely dissolved in water to form maleic acid . it has a specific density of 1 . 480 , a melting point of 52 . 85 顺酐（又称马来酸酐）为无色针状或片状结晶，有刺激性气味与酸味，易燃，升华，易溶于水生成顺丁烯二酸，相对密度为1
Causes of other types of laryngitis include acid reflux , which can cause an inflammation in the vocal cords ; bacterial infections ; fungal or yeast infections ; smoking ; chemical irritants ; and even excessively loud or prolonged use of the voice "非感冒或呼吸道感染引起的喉炎有以下几种原因：胃酸回流（可引起声带发炎） ；细菌感染；真菌或酵母感染；吸烟；接触化学刺激物；用嗓过度。
