One type of external evidence that may shed light on the transmission of Roman texts is the availability of a work in the Middle Ages, when many classical texts were circulated.

当许多经典文本都在流传时，一种可能有助于罗马文本传播的外部证据是中世纪的一部作品。

youdao

The system is heavily reliant on the availability of sunlight, and for critical tasks or areas a back-up artificial light source is required.

此系统对阳光有很强的依赖性，对于一些极端的工程或地区，需备有备用人工光源。

youdao

Then the improvement measures of traffic safety have been advanced in the light of evaluation result and the availability of the improvement measures has been showed based on VISSIM.

随后，根据评价结果，提出了相应的交通安全改善措施，并应用VISSIM仿真软件验证了两种改善方案的有效性。

youdao

Visualizing product availability data on heat maps, Locu compared the availability of beers PBR and Bud Light, the latter of which is the most widely consumed beer in America.

FORBES: Data Startup Confirms Hipster Meccas are PBR Hotbeds