英汉双语例句-生物医药大词典

It was difficult to keep a straight face when he fell over the dog.

中文意思：
当他绊着狗摔了一跤时，大家很难扳着脸不笑。

以下为相关句子列表(点击查看，可以看对应的解释）：

	It was difficult to clamber the mountain.			爬上那座大山是困难的。
	It was difficult to end the system of slavery before the Civil War because the people who owned the slaves had a vested interest in keeping it.			美国南北战争以前，要废除奴隶制度是因难的，因为维持这一制度的人有既得利益。
	It was difficult to find words worthy of the occasion.			很难找到适合於那种场合的言词.
	It was difficult to gauge how people would respond.			大家的反应如何难以估计。
	It was difficult to get to know her because she always kept everyone at a distance.			很难搞懂她，因为她总是与人保持一定的距离。
	It was difficult to keep a straight face when he fell over the dog.			当他绊着狗摔了一跤时，大家很难扳着脸不笑。
	It was difficult to make out his handwriting.			他的笔迹难以辨识。
	It was discourteous of you to arrive late.			你迟到了, 真没礼貌.
	It was discovered 5,000 feet below the surface of the Gulf of Mexico.			遗骸是在墨西哥湾海底五千英尺处被发现的。
	It was discovered after Amomum villosom trees were planted that the scaling up rate of their economic benefit was much lower than that of their cost in terms of resource environment.			发现种植砂仁后，砂仁的经济效益的递增率不如资源环境成本的递增率快。
	It was discovered that all of the softening points, viscosity and carbon yields of modified pitches got from the same process have good corresponding relationships, and different modification methods have different influences on pitch properties.			发现，同一工艺过程所得的系列沥青，其软化点、粘度及炭收率三者之间有良好的对应关系；而不同的改性方法对沥青的性能有不同的影响。