These symptoms may be referable to virus infection rather than parasites.

the ability of the virus to mutate into new forms

病毒变异成新菌株的能力

human immunodeficiency virus or HIV

人体免疫缺陷病毒，即HIV

If the virus cannot replicate itself, it cannot cause illness.

如果病毒不能变异，也就不能够诱发疾病了。

There is a virus going round the world.

世界上流行着一种病毒性疾病.

The identification of rabies virus has saved many lives.

狂犬病病毒的确认挽救了许多人的性命.

The virus latches onto the red blood cells.

这种病毒附着在红细胞上

The gunman, whose mask had slipped, fled.

面罩掉落的持枪歹徒逃之夭夭了。

His mask of detachment cracked, and she saw for an instant an angry and violent man.

他冷静超然的伪装破碎了，一瞬间她的面前出现了一个愤怒而又狂暴的男人。

The healthy trade figures mask a much gloomier picture.

繁荣的贸易数据背后掩盖着贸易极不景气的真相。

You must wear goggles and a mask that will protect you against the fumes.

为了免受烟雾危害，你必须戴上护目镜和面罩。

The mask is left on for about 15 minutes while it sets to a rubbery texture.

面膜敷上后等约15分钟，待其变成橡胶状质地。

Water had fogged his diving mask and he couldn't remember how to clear it.

水的雾气模糊了他的潜水镜，他却不记得该怎样除雾了。

This mask leaves your complexion feeling soft and supple.

这种面膜能使你的皮肤变得柔软细嫩。

Kate realized that the previous hard look on Maggie's face had been a mask.

凯特意识到玛吉原先的那副冷酷表情其实是装出来的。

The mask was so lifelike it was quite frightening.

该面具非常逼真以至看起来有点恐怖.

The jokes were a mask to hide his sadness.

玩笑是掩盖他内心悲伤的方式.

He conceals his worries behind a mask of nonchalance.

他装作若无其事,借以掩饰内心的不安.

The enemy mask their enmity under an appearance of friendliness.

敌人用友好的外表来掩饰内心的敌意.

Behind the mask of friendliness, I know he really dislikes me.

在友善的面具后面, 我知道他其实并不喜欢我.

He patched together a mask for the fancy party.

他为参加化装舞会匆匆制作了一个假面具.