网址

wǎng zhǐ website; web address; URL

：bt55net a 网络

wǎng luò network (computing, telecommunications, transport etc)

Wǎng luò Internet

是

shì is; are; am; yes; to be

shì variant of 是[shi4]; (used in given names)

有效

yǒu xiào effective; in effect; valid

的

de of; ~'s (possessive particle); (used after an attribute); (used to form a nominal expression); (used at the end of a declarative sentence for emphasis)

dí really and truly

dì aim; clear

dī see 的士[di1 shi4]