this; these; (commonly pronounced zhei4 before a classifier, esp. in Beijing)[cedict]
道
dàoㄉㄠˋ
direction; way; method; road; path; classifier for long thin stretches, rivers, roads etc; principle; truth; morality; reason; skill; method; Dao (of Daoism); to say; to speak; to talk[cedict]
必须
bì xūㄅㄧˋ ㄒㄩ
to have to; must[cedict]
在
zàiㄗㄞˋ
(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
之间
zhī jiānㄓ ㄐㄧㄢ
between; among; inter-[cedict]
用
yòngㄩㄥˋ
to use[cedict]
极
jíㄐㄧˊ
extremely; pole (geography, physics); utmost; top[cedict]
快
kuàiㄎㄨㄞˋ
fast; quick; swift[cedict]
的
deㄉㄜ˙
díㄉㄧˊ
dìㄉㄧˋ
of; structural particle: used before a noun, linking it to preceding possessive or descriptive attributive[cedict]