動詞 attest:

1. provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
   同義詞：certify, manifest, demonstrate, evidence
2. authenticate, affirm to be true, genuine, or correct, as in an official capacity
3. give testimony in a court of law
   同義詞：testify, take the stand, bear witness
4. establish or verify the usage of

1. Several witnesses can attest to her good character.
   好幾位證人證實(shí)她品行端正。
2. The child's good health attests to his mother's care.
   孩子的健康證實(shí)他母親的悉心照料。

at.test

v.（動詞）
at.test.ed,at.test.ing,at.tests
v.tr.（及物動詞）
To affirm to be correct, true, or genuine.
宣稱…為真實(shí)的：肯定是確實(shí)的、真實(shí)的或正確的

To certify by signature or oath.
證明，證實(shí)：用簽名或誓言來證明是真的
To certify in an official capacity.
證明，證實(shí)：以官方職位來證明是真的
To supply or be evidence of:
證據(jù)，作證：為…提供證明或作為…的證據(jù)：
例句：
splendid tombs that attested their power.See Synonyms at indicate
作為他們權(quán)力證據(jù)的輝煌墓碑參見 indicate

To put under oath.
使宣誓，使發(fā)誓
v.intr.（不及物動詞）
To bear witness; give testimony:
證實(shí)，證明：提供證據(jù)；給出證言：
例句：
attested to their good faith.
證明他們的良好信譽(yù)

n.（名詞）
Archaic Attestation.
【古語】 證實(shí)，證明，證據(jù)

來源：
Latin attest3ro
拉丁語 attest3ro
ad- [ad-]
ad- [前綴，表示.（運(yùn)動的）方向.，.變化.]
test3ro [to be witness] from testis [witness] * see trei-
test3ro [做證明] 源自 testis [證人，證據(jù)] *參見 trei-

【引伸】
attest.ant
n.（名詞）
at.testa.tion
attest.er 或
attes.tor
n.（名詞）