I am afraid that you have to alter your optimistic in light of the tragic news that has just arrived.
介于刚才发生的悲剧我恐怕你不能再抱以乐观
介于刚才得到的不幸消息， 我恐怕你必须改变你的乐观态度了
in light of 鉴于
All the people in the stadium cheered up when they saw hundreds of coloreds of colorful balloons ascend into the sky.
当他们看到上百只五彩缤纷的气球升上天空，体育馆里所有人都欢呼起来。
Very few people could understand the lecture the professor delivered because its subject was very obscure.
Very few 极少
The lecture the professor delivered=to deliver a lecture 作讲座
极少数人能停=明白教授的讲座因为他的科目太难理解了
even the smallest slip could permanently the paralyze patient.
即使是最小的滑倒也能导致永久性地瘫痪病人
即使最小的失误也可能导致病人终身瘫痪
it’s difficult to conceive of a plan to end poverty.
很难想出消除贫困的计划
The director was critical of the way we were doing the work
主管批评我们的工作方式
We realized that he was under great stress, so we took no notice of his bad temper.
我们意识到他正处于高压之下，所以我们没在意他的坏脾气
owing to competition among the airlines, travel expenses have been reduced considerably
由于航空公司间激烈的竞争，旅行花销节省了相当
由于航空公司之间竞争激烈，旅费大幅度下降了
Taking photographs is strictly forbidden here, as it may damage the precious cave paintings.
这里禁止拍照，它可能会损坏珍贵的壁画
这里严禁拍照，因为那会破坏珍贵的壁画
He was such a dynamic speaker that he held our attention every minute of the three-hour lecture.
他是多么充满活力的演讲人，三个小时的讲座里，它抓住了我们我们每一分钟的注意力
那位演讲人很有活力，整整三个小时的演讲中，他牢牢抓住了我们的注意力
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