常

介电常数

jiè diàn cháng shù

dielectric constant

通常

tōng cháng

regular; usual; normal

进退有常

jìn tuì yǒu cháng

to advance or retreat, each has its rules (idiom from Zhuangzi); many translations are possible

重力异常

zhòng lì yì cháng

gravitational anomaly (geology)

闲话家常

xián huà jiā cháng

to chat about domestic trivia (idiom)

阿伏伽德罗常数

ā fú jiā dé luó cháng shù

Avogadro's number (chemistry)

类精神分裂型人格违常

lèi jīng shén fēn liè xíng rén gé wéi cháng

schizoid personality disorder (SPD)

骨髓增生异常综合征

gǔ suǐ zēng shēng yì cháng zōng hé zhēng

myelodysplastic syndrome (MDS)

黑白无常

hēi bái wú cháng

(Chinese folk religion) Heibai Wuchang: two deities, one dressed in black and the other in white, responsible for escorting the spirits of the dead to the underworld

一反常态

yī fǎn cháng tài

complete change from the normal state (idiom); quite uncharacteristic

一反往常

yī fǎn wǎng cháng

(idiom) contrary to what usually happens

一如往常

yī rú wǎng cháng

as usual