1.
A set of four persons or things.
四人一组或四物一套
2.
Something having four parts, units, or members, such as a musical quartet or a four - cylinder engine.
四个一组之物四个（人或物）一组，如音乐四重奏，四缸发动机等
3.
Fourth in a group of four identical things.
第四（份）的一组四件相同的物体中的第四件的
4.
A rectangular area surrounded on all four sides by buildings.
四方院，四方场地四周有建筑物围绕的矩形空地
5.
TBAB-THF Hydrate Mixture as a Cold Storage Medium
四丁基溴化铵-四氢呋喃系蓄冷水合物
6.
representing three quarters of something.
代表某事物的四分之三。
7.
tetrahydroisoquinoline alkaloid
四氢异喹啉类生物碱
8.
Ethylene-tetrafluoroethylene ETFE
乙烯-四氟乙烯共聚物
9.
sodium peroxoborate tetrahydrate
过氧化硼酸钠（四水合物）
10.
A homologous posterior part in quadrupeds.
四足动物的类似的后部
11.
The buildings bordering this area.
四方院周围的建筑物
12.
IV. POLICIES AFFECTING TRADE IN GOODS 15
四、影响货物贸易的政策
13.
4C/S china goods, marked UP.
瓷器货物四箱，UP标记。
14.
Four cuckoos inside the zoo.
动物园里四只杜鹃。
15.
There are four cuckoos in the zoo .
动物园里有四只杜鹃。
16.
sodium tetraborate decahydrate
四苯(基)硼酸钠十水合物
17.
a child of the May 4th Movement
五四运动时代的产物
18.
(4) his cultural objects, books and reference materials;
(四)公民的文物、图书资料；