when
音標發(fā)音
- 英式音標 [w?n]
- 美式音標 [w?n]
- 英式發(fā)音
- 美式發(fā)音
基本解釋
- adv. 什么時候；什么情況下；什么場合下；（用于時間的表達方式之后）在那時，其時；當(dāng)時，當(dāng)場
- pron. 什么時候；何時
- conj. 在……時候；在……之后；在任何……時候；一……就； 考慮到，既然；雖然，然而，可是
- n. 時間，時候；日期；場合
詞源解說
- 直接源自古英語的hwenne，意為何時。
用法辨析
- when的基本意思是“什么時候”?？捎米饕蓡柛痹~,用來詢問某事曾發(fā)生或?qū)⒁l(fā)生的時間,引導(dǎo)特殊疑問句; 還可用作關(guān)系副詞引導(dǎo)限制性定語從句、非限制性定語從句和表語從句,表示“是…時候的事”。
- when可用作從屬連詞,引導(dǎo)狀語從句,表示時間時作“當(dāng)…時,在…的時候”解; 表示條件時作“如果,要是”解; 表示對比時作“既然,考慮到”解。當(dāng)when所引導(dǎo)的從句的主語和主句的主語一致時,常將其主語、系動詞或助動詞省去,只留實義動詞或表語,或者改寫為短語。
- when所引導(dǎo)的時間狀語從句用一般現(xiàn)在時代替將來時,用現(xiàn)在完成時代替將來完成時。
adv. (副詞)
conj. (連詞)
英漢例句
- When did you see him last?
你上次是什么時候見到他的? - Often she will weep when alone.
她一個人時?？蕖?/li>
用作副詞 (adv.)
用作連詞 (conj.)
詞組短語
- Remember When 記得當(dāng)時;曾幾何時;記妥當(dāng)時
- Say When 酒斟夠了請說一聲;夠了就說;夠了就請告訴我
- When Rendering 只有在最后渲染時才重新計算更新效果;渲染時
- When all 此時;當(dāng)所有
- Use When 何時用;什么時候用
短語
英英字典
- at what time; at the time at which
- what/which time
- (CONSIDERING THAT) considering the fact that
- (ALTHOUGH) despite the fact that
- You use when to ask questions about the time at which things happen.
- If something happens when something else is happening, the two things are happening at the same time.
- You use when to introduce a clause in which you mention something that happens at some point during an activity, event, or situation.
- You use when to introduce a clause where you mention the circumstances under which the event in the main clause happened or will happen.
- You use when after certain words, especially verbs and adjectives, to introduce a clause where you mention the time at which something happens.
- You use when to introduce a clause that specifies or refers to the time at which something happens.
- You use when to introduce the reason for an opinion, comment, or question.
- You use when in order to introduce a fact or comment which makes the other part of the sentence rather surprising or unlikely.
劍橋英英字典
柯林斯英英字典
專業(yè)釋義
- 既然
- 時間
The simulation results show that the identification rate can achieve 99 % and the average identification time is 1.8 ms,when position noise is in the max position error.
仿真實驗表明:當(dāng)位置噪聲在估計最大位置誤差范圍以內(nèi)時,本算法識別成功率可達99%以上,平均識別時間為1.8 m s,很好地滿足了星圖識別的要求。