optional什么意思解释？

optional的音标：optional的英式发音音标为：['ɒpʃənl]optional的美式发音音标为：['ɑpʃənl]...

We also recommend a full day optional excursion to the Upper Douro.我们还推荐去杜罗河上游的短途自选一日游。The course consists of ten core modules and five optional modules.这门课程包括十个必修单元和五个选修单元。Certain courses are compulsory, others are opti...

optional的反义词有：compulsory, required, compulsory。adj.optional的反义词（随意的;选修的）：compulsory。optional的反义词（其他释义）：required, compulsory。...

Optional extras include cooking tuition at a top restaurant...可选的额外项目包括在顶级餐厅学习厨艺。The goods are optional, but only one.这些物品是可以任选的, 但只能选一个。Elevation view of a tapered key with optional gib head.具有可选钩头的锥形键的正视图.The third col...

optional的近义词/同义词有：voluntary, elective, voluntary, elective。adj.optional的近义词（自愿的,志愿的）：voluntary, elective。optional的近义词（其他释义）：voluntary, elective。...

adj.纯真的，（风格）简单的，没有经过性交的，（性生活）忠于配偶的...

The basin favours the development of farming and animal husbandry.这个盆地有利于农业和畜牧业的发展.I hate asking favours of people.我不愿求别人给予照顾.The teacher favours serious students.老师喜欢认真的学生....

“脚印”的拼音为：jiǎo yìn...

profiteer的现在进行时为：profiteering...

n.血质不良，血恶液质...

Llewelyn's stallion shied as the wind sent sparks flying.风一吹来，火星四溅，卢埃林的种马惊跳起来。Showers of sparks flew in all directions.一大串火星四处飞溅。The wind sent sparks and cinders flying.风吹得火星、灰渣乱飞。...

golfotron的音标：golfotron的英式发音音标为：['gɒlfətrən]golfotron的美式发音音标为：['gɒlfətrən]...

The freedom of the press is one of the great bulwarks of liberty.新闻自由是自由最大的保障之一.Surgery and X - irradiation nevertheless remain the bulwarks of cancer treatment throughout the world.外科手术和 X 射线疗法依然是全世界治疗癌症的主要方法.Bulwarks u...

Since 1977 otter hunting has been illegal.捕猎水獭1977年以后就被列为非法了。Von Otter was superb both in the darkly dramatic songs, and in the lighter ones.冯·奥特无论是演唱严肃的戏剧曲目还是较为轻松愉快的歌曲时，都表现得无可挑剔。The otter , as knowing all the paths, too...

“克拉”的拼音为：kè lā...

如何使合法用户快捷地访问资源, 使非法用户被迅速发现? 这就涉及到访问控制问题.How to make legal users access resources quickly, and illegal users be found out quickly?...

He is infatuated with her, and doesn't see her faults.他对她着了迷, 看不出她的缺点.Infatuated with Queen Cleopatra of Egypt, Antony lost his will to fight.安东尼沉迷于埃及女王克娄帕特拉的美色, 失去了斗志.He was utterly infatuated with her...他完全被她迷住了。S...

这些例证是这部词典独有的。The examples are unique to this dictionary.我们觉得他采用的那些例证启发性不是特别大。We didn't find the examples he used particularly illuminating.我们关于正确与错误的概念在法律上取得了例证.Our ideas about right and wrong are exemplified in the...

solders的音标：...