Observe whether foods are stored in cool condition . reject any unclean , opened or damaged package 如发现食品包装不清洁已打开或破损，便不要购买该食品。
It is caused by poor dental hygiene . a layer of plaque accumulates along the gum margin 牙周病的形成，一般是由于牙齿不清洁，导致牙垢膜积聚在牙齿表面。
Unsafe water and sanitation cause an estimated 80 per cent of all diseases in the developing world 不卫生的水和不清洁的环境估计造成了发展中国家所有疾病的80 。
Fogged negatives or insufficient density in positives , particularly in the highlights or in fine printing detail , may cause this problem 不清洁的负片或浓度不足的正片容易在较精细印刷的亮部处发生这种现象。
Poor : general appearance reflects disorganization and poor housekeeping practices . floor , walls , ceilings , and / or equipment are in need of major repair 不好的：外观杂乱无章、不清洁。地面、墙面、天花板、或设备需要大修。
Drivers are reminded that if their thumbs are unclean , too dry or too moist , the fingerprint scanner s ability to read their thumbprints will be affected 发言人提醒跨境司机，拇指不清洁、太乾燥或太湿都会影响指纹扫描器读取指纹。
Cleaning not followed by disinfection is better than disinfection not preceded by cleaning : disinfection is an effective measure only when used on a surface that has been cleaned 清洁后不消毒比消毒前不清洁好：消毒只有在清洁后的表面上才发挥作用。
Passengers with fingertips too dry , moist or unclean could encounter difficulties with fingerprint verification when using e - channels for immigration clearance 当使用e -道办理出入境手续时，如他们的手指皮肤太乾、太湿或不清洁，在核对指模时会遇到困难。
The freemason smiled his mild , fatherly smile . the highest wisdom and truth is like the purest dew , which we try to hold within us , said he . can i hold in an impure vessel that pure dew and judge of its purity “至高的智慧和真理仿佛是我们要吸收的最清洁的水分， ”他说， “我是否能把这种清洁的水分装进不清洁的器皿，再来评论它的洁净呢？
When lax regulations in a particular area ? for example , in taiyuan , shanxi province ? allow pollution to greatly exceed both local and national standards , exclusive reliance on unclean energy sources becomes an international threat 对于特殊的地区，如山西太原，如果法规过于宽松的话，就会使那里的污染大大超过当地的、甚至全国的标准，这种对不清洁能源的过分依赖最终会对全球造成影响。
