单词：primary xylem
primary xylem的用法和样例：
例句
- In nonwoody plants the primary xylem is the only water-conducting tissue, but in mature plants with secondary growth this function is mostly taken over by the secondary xylem.在尚未木质化的植物中，初生木质部是唯一的输水组织，但在具有次生生长的成熟植物中，该功能大多由次生木质部行使。
单词：primary xylem 相关文章
By Mike O'Sullivan Los Angeles 21 May 2008 Hillary Clinton won the Kentucky primary election, Tuesday, by a margin of more than two to one, but Barack Obama won the race in Oregon and passed a milestone in the Democratic Party's presidential contest.
VOA标准英语2008年（五月）
Kerry Expected to Win Wisconsin Primary Greg Flakus Voters are going to the polls in the Midwestern state of Wisconsin in a primary contest that could represent the end of at least one candidacy for t
VOA2004（上）--各类新闻
The World Health Organization is urging governments to adopt primary health care and universal coverage as the best ways of improving health and saving lives. This year's World Health Report says primary health care can provide billions of people fa
VOA标准英语2008年（十月）
By Greg Flakus Houston 11 March 2008 Voters in the southern state of Mississippi are going to the polls in that state's Democratic Party presidential primary. Opinion polls put Senator Barack Obama in first place, but, as VOA's Greg Flakus reports fr
VOA标准英语2008年（三月）
Former Massachusetts Governor Mitt Romney took a major step Tuesday toward winning the Republican Partys presidential nomination with a convincing victory in the New Hampshire presidential primary. Romney easily defeated five Republican rivals one we
英语新闻
CANBERRA, Feb. 18 (Xinhua) -- Australian Labor Party's primary vote stands at just 30 percent, down 5 points since December, the latest Herald/Nielsen poll published in Fairfax newspapers showed on Monday. This is the first time that Tony Abbott is t
英语新闻