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四级士官

繁体：四級士官

si4 ji2 shi4 guan1

• sergeant first class

四维

繁体：四維

si4 wei2

• the four social bonds: propriety, justice, integrity and honor
• see 禮義廉恥|礼义廉耻[li3 yi4 lian2 chi3]
• the four directions

四维空间

繁体：四維空間

si4 wei2 kong1 jian1

• four-dimensional space (math.)

四县腔

繁体：四縣腔

Si4 xian4 qiang1

• Sixian dialect of Hakka Chinese

四圣谛

繁体：四聖諦

si4 sheng4 di4

• the Four Noble Truths (Buddhism)
• see also 四諦|四谛[si4 di4] and 苦集滅道|苦集灭道[ku3 ji2 mie4 dao4]

四声

繁体：四聲

si4 sheng1

• the four tones of Middle Chinese: level tone 平聲|平声, rising tone 上聲|上声, departing tone 去聲|去声 and entering tone 入聲|入声
• the four tones of Modern Standard Mandarin

四声杜鹃

繁体：四聲杜鵑

si4 sheng1 du4 juan1

• (bird species of China) Indian cuckoo (Cuculus micropterus)

四肢

si4 zhi1

• the four limbs of the body