Merriam-Webster's Vocabulary Builder 词根笔记（13）JECT
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1.每篇文章介绍一个词根及四个含有词根的单词
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JECT comes from jacere, the Latin verb meaning “throw” or “hurl.” To reject something is to throw (or push) it back; to eject something is to throw (or drive) it out; and to inject something is to throw (or squirt) it into something else.
JECT 来自拉丁动词jacere，意思是“throw” or “hurl.”。reject就是扔（或推回）它; eject就是抛出（或驱逐）它; inject一些东西就是把它扔进（或喷射）到别的东西中。
1.interject/ˌɪntəˈdʒekt $ -ər-/
To interrupt a conversation with a comment or remark.(突然)插入
• His anger was growing as he listened to the conversation, and every so often he would interject a crude comment. 他听到谈话时愤怒越来越大，他经常会插嘴说一句粗鲁的评论。
According to its Latin roots, interject ought to mean literally “throw between.” For most of the word's history, however, the only things that have been interjected have been comments dropped suddenly into a conversation. Interjections are often humorous, and sometimes even insulting（侮辱的）, and the best interjections are so quick that the conversation isn't even interrupted.
2.conjecture /kənˈdʒɛktʃɚ/
To guess.推测;猜测
• He was last heard of in Bogotá, and they conjectured that he had met his end in the Andes at the hands of the guerrillas. 他最近的踪迹是在Bogotá，他们猜测他已经在安第斯山脉被游击队了结了。
Formed with the prefix con-, “together,” conjecture means literally “to throw together”—that is, to produce a theory by putting together a number of facts. So, for example, Columbus conjectured from his calculations that he would reach Asia if he sailed westward, and his later conjecture that there was a “Northwest Passage” by sea from the Atlantic to the Pacific over the North American continent was proved correct centuries later.
3.projection/prəˈdʒekʃən/
An estimate of what might happen in the future based on what is happening now.预计；预测；估计
• The president has been hearing different deficit projections all week from the members of his economic team. 总统整个星期都从他的经济团队成员那里听到了不同的赤字预测。
Projection has various meanings, but what they all have in common is that something is sent out or forward. A movie is projected（投影） onto a screen; a skilled actress projects her voice out into a large theater without seeming to shout; and something sticking out from a wall can be called a projection. But the meaning we focus on here is the one used by businesses and governments. Most projections of this kind are estimates of a company's sales or profits—or of the finances of a town, state, or country—sometime in the future.【这种预测大多数是对公司销售额或利润的估计，或者是对未来某个时间的某个城镇，州或国家财务状况的估计。】
4.trajectory/trəˈdʒektəri/
The curved path that an object makes in space, or that a thrown object follows as it rises and falls to earth.轨道;轨迹
• Considering the likely range, trajectory, and accuracy of a bullet fired from a cheap handgun at 100 yards, the murder seemed incredible. 考虑到100码距离上廉价手枪射出子弹的可能范围，轨迹和精度，这场谋杀似乎令人难以置信。
Formed with part of the prefix trans-, “across,” trajectory means a “hurling across.” By calculating the effect of gravity and other forces, the trajectory of an object launched into space at a known speed can be computed precisely. 【通过计算重力和其他力的影响，可以精确计算以已知速度发射到空间的物体的轨迹。】 Missiles（导弹） stand a chance（有可能） of hitting their target only if their trajectory has been plotted accurately. The word is used most often in physics and engineering, but not always; we can also say, for example, that the trajectory of a whole life may be set in a person's youth, or that a new book traces the long trajectory（发展轨迹，起落） of the French empire. 【例如，我们也可以说，一生的轨迹可能在一个人的青春中确定，或者一本新书追溯法国帝国的漫长轨迹。】