形容詞 loyal:

1. steadfast in allegiance or duty
2. inspired by love for your country
   同義詞：patriotic
3. unwavering in devotion to friend or vow or cause
   同義詞：firm, truehearted, fast

1. We are loyal to our motherland.
   我們忠于祖國(guó)。
2. He remained loyal to me through thick and thin.
   他歷盡艱辛始終都忠實(shí)於我。
3. Qualify your statement that "dog is loyal" by adding "usually".
   將你說的＂狗是忠誠(chéng)的＂這句話修正一下，加上＂通常＂二字。
4. The vassal swore that he would be loyal to the king forever.
   這位封臣宣誓他將永遠(yuǎn)忠誠(chéng)于國(guó)王。
5. I may say in all sincerity that you have been my most loyal friend.
   我可以非常真誠(chéng)地說，你一直是我最忠實(shí)的朋友。
6. The soldiers are loyal to their country.
   士兵們忠于他們的國(guó)家。

loy.al

adj.（形容詞）
Steadfast in allegiance to one`s homeland, government, or sovereign.
忠心的：對(duì)自己的祖國(guó)，政府或主權(quán)無限忠誠(chéng)的
Faithful to a person, an ideal, a custom, a cause, or a duty.
忠誠(chéng)的：對(duì)一個(gè)人。一種理想，習(xí)慣，事業(yè)，責(zé)任忠實(shí)的
Of, relating to, or marked by loyalty.See Synonyms at faithful
忠誠(chéng)的：與之有關(guān)的，或有其特征的參見 faithful

來源：
French
法語(yǔ)
from Old French leial, loial
源自 古法語(yǔ) leial, loial
from Latin lôg3lis [legal]
源自 拉丁語(yǔ) lôg3lis [合法的]
from lôx lôg- [law] * see leg-
源自 lôx lôg- [法律] *參見 leg-

【引伸】
loy.ally
adv.（副詞）