但是

The effect of abscisic acid was best among four agents. But it was too expensive to apply to seed production of hybrid rice.

结论］4种药剂中，以脱落酸效果最好，但是其价格昂贵，在杂交水稻制种上无法应用。

RT-PCR analysis showed that the ZmPti1 expression was induced by salicylic acid, low-temperature, mannitol and salt but not by abscisic acid.

半定量RT-PCR分析结果显示ZmPtil基因的表达可以被水杨酸、低温、甘露醇和盐所诱导，但是不被脱落酸所诱导。

The leaf production continues, but as a result of leaf abscission, the older, lower leaves will drop off, as the plant grows taller.

叶生产继续，但是由于叶裁去，更旧，较低的叶子将减低，当植物变得更高。

Quite a few of my friends are professors, and none of them is what I would call absent-minded.

我的很多朋友是教授，但是他们中间没有一个人可以称得上是"缺心眼"的人。

But if you're so far gone you don't know you're absent-minded, you may be in trouble .

但是如果你已经发展到不知道自己健忘的地步了，那你就有麻烦了。

We're both absent-minded but good at organizing our time and possessions.

我们都经常心不在焉但是能很好的安排自己的时间和财产。

However, men rarely talk about their personal relationships and feelings, so women often complain that men absent-mindedly listen when they are talking.

但是， 人很少谈论他们的私人关系和感觉，如此妇女经常抱怨，人丢三落四地听当他们谈话。

Visual cues can help prevent absent-mindedness,"says Schacter,"But be sure the cue is clear and available.

"视觉提示能帮助你减少走神，"Schacter说，"但是要确保这些提示清楚可用。"

I have called you several times ,but you are absent.

我给你打了好几次电话，但是你都不在。

But even though I registered and downloaded a New Jersey registration at the latter the other day, I still have to mail it back to Essex County, N.J., and wait hopefully for an absentee ballot to arrive the same way -- so I can again use snail mail to cast my ballot.

但是虽然我前几天注册并下载了一份新泽西州的登记表，我还是得把它寄回纽约州艾塞克斯县，同时满期待地等着一张缺席选举人票以同样的方式送到我手中──好让我再次通过奇慢无比的邮寄方式来投下我的一票。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。